Alternatives to Language Server Protocol (LSP)
Compare Language Server Protocol (LSP) alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to Language Server Protocol (LSP) in 2026. Compare features, ratings, user reviews, pricing, and more from Language Server Protocol (LSP) competitors and alternatives in order to make an informed decision for your business.
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1
Model Context Protocol (MCP)
Anthropic
Model Context Protocol (MCP) is an open protocol designed to standardize how applications provide context to large language models (LLMs). It acts as a universal connector, similar to a USB-C port, allowing LLMs to seamlessly integrate with various data sources and tools. MCP supports a client-server architecture, enabling programs (clients) to interact with lightweight servers that expose specific capabilities. With growing pre-built integrations and flexibility to switch between LLM vendors, MCP helps users build complex workflows and AI agents while ensuring secure data management within their infrastructure.Starting Price: Free -
2
Agent Client Protocol (ACP)
Agent Client Protocol (ACP)
The Agent Client Protocol (ACP) standardizes communication between code editors, IDEs, and coding agents, making agent-editor interoperability the default instead of requiring custom integrations for every possible combination. It provides a standard interface for communication between AI agents and client applications, with a flexible, extensible, and platform-agnostic architecture designed for both local and remote scenarios. ACP addresses integration overhead, limited compatibility, and developer lock-in by allowing agents that implement the protocol to work with any compatible editor, while editors that support ACP gain access to the broader ecosystem of ACP-compatible agents. Similar in spirit to how the Language Server Protocol standardized language server integration, ACP decouples agents and editors so both sides can innovate independently while developers choose the best tools for their workflow.Starting Price: Free -
3
Lapce
Lapdev
Lapce is a cutting-edge, open-source code editor focused on delivering a fast and responsive experience, particularly for developers working with large projects or complex codebases. Written in Rust, Lapce leverages the performance advantages of native development to provide a smooth editing experience with minimal lag. It features a clean, modern interface and advanced functionality such as multi-caret editing, split views, and integrated terminal support. With built-in support for the Language Server Protocol (LSP), Lapce offers precise autocompletion, syntax highlighting, and code navigation across various programming languages, enhancing productivity. Its extensibility, support for plugins, and focus on performance make Lapce ideal for developers looking for a lightweight yet powerful editor that balances simplicity with capability, appealing to both beginners and seasoned professionals.Starting Price: Free -
4
Crush
Charm
Crush is a glamorous AI coding agent that lives right in your terminal, seamlessly connecting your tools, code, and workflows with any Large Language Model (LLM) of your choice. It offers multi-model flexibility, letting you choose from a variety of LLMs or add your own using OpenAI or Anthropic-compatible APIs, and supports mid-session switching between them while preserving context. Crush is session-based, enabling multiple project-specific contexts to coexist. Powered by Language Server Protocol (LSP) enhancements, it incorporates coding-aware context just like a developer’s editor. It's highly extensible via Model Context Protocol (MCP) plugins using HTTP, stdio, or SSE for added capabilities. Crush runs anywhere, leveraging Charm’s sleek Bubble Tea-based TUI for a polished terminal user experience. Written in Go and MIT-licensed (with FSL-1.1 for trademarks), enabling developers to stay in their terminal while taking advantage of expressive AI coding assistance.Starting Price: Free -
5
Socket.IO
Socket.IO
In most cases, the connection will be established with WebSocket, providing a low-overhead communication channel between the server and the client. Rest assured! In case the WebSocket connection is not possible, it will fall back to HTTP long-polling. And if the connection is lost, the client will automatically try to reconnect. Scale to multiple servers and send events to all connected clients with ease. Socket.IO is a library that enables low-latency, bidirectional and event-based communication between a client and a server. It is built on top of the WebSocket protocol and provides additional guarantees like a fallback to HTTP long-polling or automatic reconnection. WebSocket is a communication protocol that provides a full-duplex and low-latency channel between the server and the browser. There are several Socket.IO server implementations available. And client implementations in most major languages. -
6
FastMCP
fastmcp
FastMCP is an open source, Pythonic framework for building Model Context Protocol (MCP) applications that makes creating, managing, and interacting with MCP servers simple and production-ready by handling the protocol’s complexity so developers can focus on business logic. The Model Context Protocol (MCP) is a standardized way for large language models to securely connect to tools, data, and services, and FastMCP provides a clean API to implement that protocol with minimal boilerplate, using Python decorators to register tools, resources, and prompts. A typical FastMCP server is created by instantiating a FastMCP object, decorating Python functions as tools (functions the LLM can invoke), and then running the server with built-in transport options like stdio or HTTP; this lets AI clients call into your code as if it were part of the model’s context.Starting Price: Free -
7
Apache CouchDB
The Apache Software Foundation
Apache CouchDB™ lets you access your data where you need it. The Couch Replication Protocol is implemented in a variety of projects and products that span every imaginable computing environment from globally distributed server-clusters, over mobile phones to web browsers. Store your data safely, on your own servers, or with any leading cloud provider. Your web- and native applications love CouchDB, because it speaks JSON natively and supports binary data for all your data storage needs. The Couch Replication Protocol lets your data flow seamlessly between server clusters to mobile phones and web browsers, enabling a compelling offline-first user-experience while maintaining high performance and strong reliability. CouchDB comes with a developer-friendly query language, and optionally MapReduce for simple, efficient, and comprehensive data retrieval. -
8
Zed
Zed Industries
Zed is a next-generation code editor designed for high-performance collaboration with humans and AI. Written from scratch in Rust to efficiently leverage multiple CPU cores and your GPU. Integrate upcoming LLMs into your workflow to generate, transform, and analyze code. Chat with teammates, write notes together, and share your screen and project. Multibuffers compose excerpts from across the codebase in one editable surface. Evaluate code inline via Jupyter runtimes and collaboratively edit notebooks. Support for many languages via Tree-sitter, WebAssembly, and the Language Server Protocol. Fast native terminal tightly integrates with Zed's language-aware task runner and AI capabilities. First-class modal editing via Vim bindings, including features like text objects and marks. Zed is built by a global community of thousands of developers. Boost your Zed experience by choosing from hundreds of extensions that broaden language support, offer different themes, and more.Starting Price: Free -
9
ReportMill
ReportMill Software
Running as Java code inside your application, ReportMill seamlessly harvests data directly from any Java dataset, whether EJBs, POJOs (Plain Old Java Objects), Java Collection classes, JDBC ResultSets or any combination of these. This is much more efficient than traditional reporting tools, which often require developers to repackage existing Java datasets as the original SQL query, then force a redundant refetch and some potentially risky inter-process communication. This architecture also provides unique access to custom business logic found in the developer's object model, providing a significant savings by reusing this code instead of forcing a rewrite in proprietary template macro languages. ReportMill is the only reporting tool built on top of a comprehensive page layout application.Starting Price: $295 one-time payment -
10
NLWeb
Microsoft
NLWeb is an open project developed by Microsoft that aims to make it simple to create a rich, natural language interface for websites using the model of their choice and their own data. Our goal is for NLWeb, short for Natural Language Web, to be the fastest and easiest way to effectively turn your website into an AI app, allowing users to query the contents of the site by directly using natural language, just like with an AI assistant or Copilot. Every NLWeb instance is also a Model Context Protocol (MCP) server, allowing websites to make their content discoverable and accessible to agents and other participants in the MCP ecosystem if they choose. NLWeb leverages semi-structured formats like Schema.org, RSS, and other data that websites already publish, combining them with LLM-powered tools to create natural language interfaces usable by both humans and AI agents. -
11
Appium
The JS Foundation
Appium is an open source test automation framework for use with native, hybrid and mobile web apps. It drives iOS, Android, and Windows apps using the WebDriver protocol. Appium is built on the idea that testing native apps shouldn't require including an SDK or recompiling your app. And that you should be able to use your preferred test practices, frameworks, and tools. Appium is an open source project and has made design and tool decisions to encourage a vibrant contributing community. Appium aims to automate any mobile app from any language and any test framework, with full access to back-end APIs and DBs from test code. Write tests with your favorite dev tools using all the above programming languages, and probably more (with the Selenium WebDriver API and language-specific client libraries). -
12
Stainless
Anthropic
Stainless is a developer infrastructure platform that automatically generates production-ready SDKs, API documentation, and MCP (Model Context Protocol) servers directly from OpenAPI specifications. The platform helps API companies deliver high-quality developer and agent experiences by creating idiomatic SDKs for multiple programming languages including TypeScript, Python, Go, Java, Ruby, C#, and PHP. Stainless automates the maintenance of SDKs and documentation, ensuring they stay synchronized with API changes while reducing engineering overhead. The platform is designed to improve API usability, streamline integrations, and support AI agent interoperability through standards-based MCP server generation.Starting Price: $250 per month -
13
Xojo
Xojo
The object-oriented Xojo programming language and cross-platform rapid application development tool let you develop native applications for macOS, Windows, Linux, the web, iOS and Raspberry Pi. User interfaces are quickly and intuitively made with drag and drop and the modern framework supports features like graphics, database servers and internet protocols. Xojo abstracts you from the platform details allowing you to focus your time and energy on what makes your app unique. Xojo is free to use for learning and development.Starting Price: $99.00/user -
14
OpenTools
OpenTools
OpenTools is an API platform that enables developers to augment large language models (LLMs) with real-time capabilities such as web search, location data, and web scraping through a unified interface. By integrating with a registry of Model-Context Protocol (MCP) servers, OpenTools allows LLMs to access tools without requiring individual API keys. The API is compatible with various LLMs, including those supported by OpenRouter, and maintains resilience against outages by allowing seamless switching between models. Developers can invoke tools using a simple API call, specifying the desired model and tools, and OpenTools handles the authentication and execution. It charges only for successful tool executions, with transparent, at-cost token pricing managed through a unified billing portal. This approach simplifies the integration of external tools into LLM applications, reducing the complexity of managing multiple APIs.Starting Price: Free -
15
Network Device Discovery
Systemake
Network Device Discovery is served online through our xQuore platform under SaaS subscription mode. Network Device Discovery was developed for xQuore our online multi-language platform, English, Spanish, and more languages coming soon. Device scanning uses multiple protocols to get a broader coverage: ICMP, SMNP, WMI, OS Agent. Available Agent Apps for Android and iOS offering mobile device management using geofences. Server application for centralized continuous local network scan. We gladly offer to you free technical support during the installation process. Get instant support from our automated chatbot or from our technicians in business hours. Submit your support ticket from your Customer account. Initial fast network scan through ICMP protocol and DNS reversing. Multi treading windows service application to allow simultaneous device scan for large networks.Starting Price: $4.75 per month -
16
ToolSDK.ai
ToolSDK.ai
ToolSDK.ai is a free TypeScript SDK and marketplace that accelerates building agentic AI applications by providing instant access to over 5,300+ MCP (Model Context Protocol) servers and composable tools with one line of code, enabling developers to wire up real-world workflows combining language models with external systems. The platform exposes a unified client for loading packaged MCP servers (e.g., search, email, CRM, task management, storage, analytics) and converting them into OpenAI-compatible tools, handling authentication, invocation, and result orchestration so assistants can call, compare, and act on live data from services like Gmail, Salesforce, Google Drive, ClickUp, Notion, Slack, GitHub, analytics platforms, and custom web search or automation endpoints. It includes example quick-start integrations, supports metadata and conditional logic in multi-step orchestrations, and makes scaling to parallel agents and complex pipelines straightforward.Starting Price: Free -
17
IBM CICS
IBM
IBM® CICS® Transaction Server for z/OS® has evolved into a powerful mixed language application server, enabling developers to write and modernize applications using the languages and tools best suited to business needs and their skills. Supported languages and frameworks include Java®-based OSGi, Springboot®, Jakarta® EE, Eclipse® MicroProfile, and Node.js®-based runtime for JavaScript and TypeScript, and COBOL, C/C++, and PL/I. CICS is able to scale applications to support high-transaction workloads in a secure, robust, cost-efficient environment. Develop new applications or extend existing, mission-critical services with new interfaces. Unleash your creativity with our support for a wealth of different programming languages. Develop in CICS Transaction Server just as you would develop any other application, with plug-ins for familiar tooling such as Maven®, Gradle®, Zowe®, and UrbanCode Deploy®. -
18
AutoRest
Microsoft
The AutoRest tool generates client libraries for accessing RESTful web services. Input to AutoRest is a spec that describes the REST API using the OpenAPI specification format and streamlines the creation of client code across multiple programming languages, including C#, Java, Python, TypeScript, and Go. This automation enhances consistency and efficiency in API consumption, reducing the manual effort required to develop and maintain client libraries. AutoRest operates through a flexible pipeline that processes OpenAPI input files, transforming them into a code model which is then utilized by language-specific generators to produce client code adhering to each language's design guidelines. The tool supports both OpenAPI 2.0 and 3.0 specifications, ensuring compatibility with a wide range of APIs. Developers can install AutoRest on Windows, macOS, or Linux systems, with installation facilitated via Node.js.Starting Price: Free -
19
Agentforce Vibes
Salesforce
Agentforce Vibes introduces vibe coding, a generative AI–powered approach that lets developers convert natural language instructions into production-ready Salesforce applications with enterprise-grade security, governance, and infrastructure. Unlike simpler vibe coding tools aimed at prototyping, Agentforce Vibes supports the full development lifecycle, ideation, building, testing, deployment, and observability, while integrating with Salesforce’s platform and trust layers. It functions as an AI-powered IDE (usable within VS Code or any VS Code-compatible environment) that understands your Salesforce schema and metadata, enabling features such as agentic code generation (Apex, HTML, CSS, JavaScript), intelligent rule enforcement, test case generation, debugging, rollbacks, and natural language DevOps. It supports multiple language models, is extensible via Model Context Protocol (MCP) with over 20 built-in tools, and allows reuse of existing code. -
20
WinSCP
WinSCP
WinSCP is a popular SFTP client and FTP client for Microsoft Windows! Copy files between a local computer and remote servers using FTP, FTPS, SCP, SFTP, WebDAV, or S3 file transfer protocols. WinSCP is an open source free SFTP client, FTP client, WebDAV client, S3 client and SCP client for Windows. Its main function is file transfer between a local and a remote computer. Beyond this, WinSCP offers scripting and basic file manager functionality. Graphical user interface, translated into many languages. Integration with Windows (drag & drop, URL, shortcut icons). All common operations with files, and support for SFTP and SCP protocols over SSH and FTP and WebDAV and S3 protocols. Batch file scripting and command-line interface and .NET assembly for advanced programming tasks. Directory synchronization in several semi or fully-automatic ways. Integrated text editor, shares site settings with PuTTY, and supports password, keyboard-interactive, public key, and Kerberos authentication.Starting Price: Free -
21
Obot MCP Gateway
Obot
Obot is an open-source AI infrastructure platform and Model Context Protocol (MCP) gateway that gives organizations a centralized control plane for discovering, onboarding, managing, securing, and scaling MCP servers, services that connect large language models and AI agents to enterprise systems, tools, and data. It bundles an MCP gateway, catalog, admin console, and optional built-in chat interface into a modern interface that integrates with identity providers (e.g., Okta, Google, GitHub) to enforce access control, authentication, and governance policies across MCP endpoints, ensuring secure, compliant AI interactions. Obot lets IT teams host local or remote MCP servers, proxy access through a secure gateway, define fine-grained user permissions, log and audit usage, and generate connection URLs for LLM clients such as Claude Desktop, Cursor, VS Code, or custom agents.Starting Price: Free -
22
BoxLang
BoxLang
BoxLang is a modern, dynamically and loosely typed scripting language for the Java Virtual Machine (JVM) that supports Object-Oriented (OO) and Functional Programming (FP) constructs. It can be deployed on multiple platforms and all operating systems, web servers, Java application servers, AWS Lambda, WebAssembly, and more. BoxLang combines many features from different programming languages to provide developers with a modern, fluent, and expressive syntax. BoxLang has been designed to be a highly modular and dynamic language that takes advantage of all the modern features of the JVM. It is dynamically typed, which means there's no need to declare types. It can perform type inference, auto-casting, and promotions between different types. The language adjusts to its deployed runtime and can add, remove, or modify methods and properties at runtime. -
23
RabbitMQ
RabbitMQ
RabbitMQ is lightweight and easy to deploy on-premises and in the cloud. It supports multiple messaging protocols. RabbitMQ can be deployed in distributed and federated configurations to meet high-scale, high-availability requirements. With tens of thousands of users, RabbitMQ is one of the most popular open-source message brokers. From T-Mobile to Runtastic, RabbitMQ is used worldwide at small startups and large enterprises. RabbitMQ is lightweight and easy to deploy on-premises and in the cloud. It supports multiple messaging protocols. RabbitMQ can be deployed in distributed and federated configurations to meet high-scale, high-availability requirements. RabbitMQ runs on many operating systems and cloud environments and provides a wide range of developer tools for most popular languages. Deploy with Kubernetes, BOSH, Chef, Docker and Puppet. Develop cross-language messaging with favorite programming languages such as Java, .NET, PHP, Python, JavaScript, Ruby, Go, etc.Starting Price: Free -
24
ContextForge MCP Gateway is an open source Model Context Protocol (MCP) gateway, registry, and proxy platform that provides a unified endpoint for AI clients to discover and access tools, resources, prompts, and REST or MCP services in complex AI ecosystems. It sits in front of multiple MCP servers and REST APIs to federate and unify discovery, authentication, rate-limiting, observability, and traffic routing across diverse backends, with support for transports such as HTTP, JSON-RPC, WebSocket, SSE, stdio, and streamable HTTP, and can virtualize legacy APIs as MCP-compliant tools. It includes an optional Admin UI for real-time configuration, monitoring, and log visibility, and is designed to scale from standalone deployments to multi-cluster Kubernetes environments with Redis-backed federation and caching for performance and resilience.
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25
Visual Studio Code Live Share
Microsoft
Visual Studio Live Share is a real-time collaborative development tool that enables developers to co-edit and co-debug code, share terminals and servers, and communicate seamlessly within their preferred development environments. It supports various programming languages and application types, allowing instant and secure sharing of projects without the need for cloning repositories or setting up additional environments. Live Share facilitates pair programming, code reviews, technical interviews, and educational sessions by providing features such as shared debugging sessions, terminal instances, and localhost web app forwarding. Participants can maintain their personalized editor settings, including themes and keybindings, while collaborating, ensuring a comfortable and efficient workflow. Set breakpoints and group scroll through the code. View web applications and databases without exposing Internet ports.Starting Price: $50 per month -
26
WnetCard Modules
Medasyst
WnetCard Modules are the APIs basedon dynamic link libraries (DLLs) that extend the functionality of any programming language running on a Microsoft Windows platform. WnetCard Modules are based on true Windows low-level DLLs, which results in unparalleled speed of transaction execution. The procedural interface of WnetCard Modules is easy to implement and provides the fastest and most stable performance. Whether you are supporting legacy product or creating product in the newest Microsoft Visual Studio version, WnetCard Modules will provide processing functionality. The only language-specific tasks are the declarations of the routines and calls invoking the transaction routines. The DLLs will be linked at run time to any number of threads running in parallel. Thus, they render themselves naturally to multi-threaded processes that are characteristic of a server environment. This greatly simplifies the task of building a payment server if such a task is required. -
27
PDComms Tool
NEC Display Solutions
NEC PD Comms Tool (NEC Public Display Communications Tool) is a software application that can be used to configure, control, and test supported NEC large screen LCD display models via either RS232 or LAN connections. It can also be used to assist with developing and debugging external control systems by showing the communications protocol for commands exchanged between the software and displays. Provides easy remote access to many common controls. Access to advanced controls. Assists with diagnosing connection and configuration-related problems. Displays and logs all commands exchanged via RS232 or LAN. Shows a breakdown of how commands are constructed from the input parameters and monitor protocol. Powerful scripting command language allows complex control sequences to be performed on multiple displays. NEC PD Comms Tool provides a simple, intuitive interface to perform many functions. -
28
Limnor Studio
Limnor Studio
Limnor Studio is a pioneer in generic purpose visual programming system, released in August 2003. Many years of efforts have been devoted to developing visual languages and codeless technologies. Some new technologies have been patented in 2013. Limnor Studio is an IDE for rapid software development. The users develop software in a visual and codeless programming paradigm. Text coding is not needed. Programming is done via object construction and event-linking. Event-linking is shown in Event-Path visual language. Function development is done via control-flow visual language. Same programming approach is used for standalone software development and web development. In web develoment, client server boundary is removed. Developing a web application is done as if it is developing a standalone application. It is the first fully automated cloud computing system in the world. -
29
BrowserOS
BrowserOS
BrowserOS is an open source, agent-enabled browser built on a Chromium fork that brings AI agents directly into your web environment, letting you automate tasks, navigate, and interact with web apps simply by using natural language. You log into sites as usual, and with plain-English instructions like “scrape the quarterly results from this page and update a spreadsheet,” BrowserOS generates and runs a repeatable agent locally, handling clicks, form-fills, and navigation chores for you. It features built-in split-view access to major large-language-models such as ChatGPT, Claude, or Gemini, supports local model execution via platforms like Ollama, and ensures full compatibility with Chrome extensions and your existing bookmarks and passwords. With semantic search across browser history and bookmarks, highlighter tools, and the ability to install MCP (Model-Context-Protocol) servers for Gmail, Calendar, Docs, and Notion, the browser becomes a productivity hub.Starting Price: Free -
30
Kyoto Tycoon
Altice Labs
Kyoto Tycoon is a lightweight network server on top of the Kyoto Cabinet key-value database, built for high-performance and concurrency. Some of its features include. It has its own fully-featured protocol based on HTTP and a (limited) binary protocol for even better performance. There are several client libraries implementing them for multiple languages (we're maintaining one for Python here). It can also be configured with simultaneous support for the memcached protocol, with some limitations on available data update commands. This is useful if you wish to replace memcached in larger-than-memory/persistency scenarios. Here you can find improved versions of the latest available upstream releases, intended to be used together and tested in real-world production environments. The changes include bug fixes, minor new features and packaging for a few Linux distributions. -
31
FireMonkey
Embarcadero Technologies
With FireMonkey, you don't have to maintain separate development projects to deliver your app natively for multiple devices (PCs, tablets and smartphones) on multiple platforms (Windows, OS X, iOS and Android). FireMonkey makes it easy to build script-free, true native apps that expose the full range of device capabilities and performance in the underlying devices. No matter how dazzling the visuals are, if the user experience is sluggish or unresponsive, it all falls down. FireMonkey apps leverage the full power of today's hardware with native CPU performance and GPU-powered visuals on PCs, tablets and mobile devices. With FireMonkey, you get performance and responsiveness that you simply can't get from RIA platforms, virtual machine runtimes, or dynamic languages. FireMonkey applications easily connect to the most popular databases, Web and cloud services, internet protocols and mobile devices – giving you incredible business flexibility for both clients and servers.Starting Price: $2,000 one-time payment -
32
Repo Prompt
Repo Prompt
Repo Prompt is a macOS-native AI coding assistant and context engineering tool that helps developers interact with, refine, and modify codebases using large language models by letting users select specific files or folders, build structured prompts with exactly the relevant context, and review and apply AI-generated code changes as diffs rather than rewriting entire files, ensuring precise, auditable modifications. It provides a visual file explorer for project navigation, an intelligent context builder, and CodeMaps that reduce token usage and help models understand project structure, and multi-model support so users can bring their own API keys for providers like OpenAI, Anthropic, Gemini, Azure, or others, keeping all processing local and private unless the user explicitly sends code to an LLM. Repo Prompt works as both a standalone chat/workflow interface and an MCP (Model Context Protocol) server for integration with AI editors.Starting Price: $14.99 per month -
33
Webgenz CMS
Webgenz
Webgenz CMS is a powerful, practical solution for front-end web development. Designed for professional and corporate developers, Webgenz CMS increases productivity by maximizing reuse. A full-featured macro language allows modular and object-oriented coding techniques to be applied to HTML. Webgenz CMS makes your front-end development more efficient and predictable, while ensuring site-wide consistency and the separation of presentation from content. Use it stand-alone or add it to an existing site management infrastructure. Either way, Webgenz CMS instantly accelerates your development project. Real value. Affordable price. Code reuse increases productivity and site-wide consistency. Webgenz CMS provides a full-featured macro language that enables you to reuse any element of code, from document templates to link definitions and everything in between. Webgenz CMS allows you to define and manage document structure, presentation, and content independently. -
34
PureScript
PureScript
PureScript is a strongly typed, purely functional programming language that compiles JavaScript. It enables developers to build robust web applications, web servers, and mobile apps using functional programming techniques. PureScript offers features such as algebraic data types, pattern matching, row polymorphism, extensible records, higher-kinded types, type classes with functional dependencies, and higher-rank polymorphism. The language emphasizes strong static typing and pure functions, ensuring code reliability and maintainability. Developers can compile PureScript code into readable JavaScript, facilitating seamless integration with existing JavaScript codebases. The ecosystem includes an extensive collection of libraries, excellent tooling, and editor support with instant rebuilds. An active community provides numerous learning resources, including the PureScript book, which offers practical projects for beginners. -
35
SoftEther VPN
SoftEther Project
SoftEther VPN Project develops and distributes SoftEther VPN, as an academic project from University of Tsukuba, under the Apache License 2.0. The API Suite allows you to easily develop your original SoftEther VPN Server management application to control the VPN Server (e.g. creating users, adding Virtual Hubs, disconnecting a specified VPN session) from JavaScript, TypeScript, C# or other languages. SoftEther VPN ("SoftEther" means "Software Ethernet") is one of the world's most powerful and easy-to-use multi-protocol VPN software. It runs on Windows, Linux, Mac, FreeBSD and Solaris. SoftEther VPN is open source. You can use SoftEther for any personal or commercial use for free charge. SoftEther VPN is an optimum alternative to OpenVPN and Microsoft's VPN servers. SoftEther VPN has a clone-function of OpenVPN Server. You can integrate from OpenVPN to SoftEther VPN smoothly. SoftEther VPN is faster than OpenVPN. -
36
Tambo
Tambo
Tambo is an open source AI orchestration framework focused on React front-end apps, letting developers build rich, generative UI assistants that respond to natural language. With Tambo, you register React components and tools once, and the system handles when and how to display UI components (forms, dashboards, charts, etc.), manage state, and call APIs/tools as needed. It supports features like message-thread history, streaming UI/content, suggested actions, authentication, and integration with Model Context Protocol (MCP) servers for context or external data. There’s a pre-built component library to accelerate development (e.g., control bars, message threads, generative forms), CLI tools, hosting via Tambo Cloud, and self-hosting options. Plans range from a free tier (with message/usage limits and community support) to paid tiers that offer higher message volumes, team seats, SSO/RBAC, SLAs, observability, and more.Starting Price: $25 per month -
37
Swagger Codegen
SmartBear
Swagger Codegen can simplify your build process by generating server stubs and client SDKs for any API, defined with the OpenAPI (formerly known as Swagger) specification, so your team can focus better on your API’s implementation and adoption. Moving from design to development has never been easier with Swagger Codegen in SwaggerHub. API Definition files can be used to create stubs in popular languages, like Java, Scala, and Ruby, with just a few clicks.Starting Price: Free -
38
Superdesign
Superdesign
SuperDesign is an AI-powered design agent that helps users generate high-quality user interface mockups, reusable components, wireframes, and frontend code from simple natural language prompts, enabling designers and developers to go from idea to interface faster by reducing context switching between tools like Figma and code editors and bringing design generation directly into development workflows. It is built as an open source design agent that lives inside popular development environments and editors, including Cursor, Windsurf, and Visual Studio Code, and integrates with large language models to interpret prompt descriptions and produce visual designs and structured outputs that match a project’s needs, helping teams explore multiple design variations in parallel for better creative iteration. SuperDesign can also import live webpages or specific UI components and convert them into editable designs or tidy code workspaces.Starting Price: Free -
39
Llama Stack
Meta
Llama Stack is a modular framework designed to streamline the development of applications powered by Meta's Llama language models. It offers a client-server architecture with flexible configurations, allowing developers to mix and match various providers for components such as inference, memory, agents, telemetry, and evaluations. The framework includes pre-configured distributions tailored for different deployment scenarios, enabling seamless transitions from local development to production environments. Developers can interact with the Llama Stack server using client SDKs available in multiple programming languages, including Python, Node.js, Swift, and Kotlin. Comprehensive documentation and example applications are provided to assist users in building and deploying Llama-based applications efficiently.Starting Price: Free -
40
OpenSMTPD
OpenSMTPD
OpenSMTPD is a free implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to exchange emails with other systems speaking the SMTP protocol. Started out of dissatisfaction with other implementations, OpenSMTPD is a fairly complete SMTP implementation. OpenSMTPD is primarily developed by Gilles Chehade and Eric Faurot, with contributions from various OpenBSD hackers and members from other communities.Starting Price: Free -
41
liblab
liblab
Reduce your customers' API integration time by offering SDKs in languages they are familiar with. Our SDK Code Generator creates language-specific SDKs in under a minute and integrates into your CI/CD pipeline for no-touch maintenance with every API update. Generate SDKs in multiple languages with built-in best practices in less than a minute. Integrate them into your CI/CD pipeline to keep SDKs and documentation synchronized with every API update, with no additional engineering effort required. Autogenerate SDKs in Python, Java, Typescript, C#, Go, and PHP with language best practices built in. Easily integrate SDK deployments into your CI/CD pipeline without extra work. liblab automates the process for PyPI, Maven, NuGet, Go, Packagist, and npm.Starting Price: $120/month -
42
EasiPos 7
Ankerdata
EasiPos-7 is a high-quality Point of Sale & Data Management solution for tables, quick service and general retail applications. EasiPos-7 is robust, feature rich, fast and extremely user-friendly. EasiPos 7 has many unique and powerful features that other Point of Sale systems do not - features that are specifically engineered to improve your profitability from day one of implementation. Server languages operate in tandem with the base (or setup) language – in other words, a server may interact in German, another server in Spanish, and yet another in French. Up to five languages, including the base language, are supported. Server languages can also be auto-selected from the server parameters. The standard base language is English. Versatility is a key component which is why EasiPos 7 is the right fit for your operation with connectivity to a variety of applications and devices. EasiPos easily integrates with various applications. -
43
mcp-use
mcp-use
mcp-use is an open source development platform offering SDKs, cloud infrastructure, and a developer-friendly control plane for building, managing, and deploying AI agents that leverage the Model Context Protocol (MCP). It enables connection to multiple MCP servers, each exposing specific tool capabilities like browsing, file operations, or specialized integrations, through a unified MCPClient. Developers can create custom agents (via MCPAgent) that dynamically select the most appropriate server for each task using configurable pipelines or a built-in server manager. It simplifies authentication, access control, audit logging, observability, sandboxed runtime environments, and deployment workflows, whether self-hosted or managed, making MCP development production-ready. With integrations for popular frameworks like LangChain (Python) and LangChain.js (TypeScript), mcp-use accelerates the creation of tool-enabled AI agents.Starting Price: Free -
44
Across Language Server
Across Systems
The Across Language Server is our translation management system for enterprises and language service providers. It supports the entire translation process from the project and workflow control to the translation, correction, and release. Thus, it facilitates the localization of your product and corporate communication for the international market. The central translation memory stores all sentences in a central database and makes them available to all involved in a project. In this way, they can later be reused for other translations. Across is easy to use, even when special requirements such as the translation of display texts or documents with change tracking are involved. Moreover, you will always translate in the same working environment, regardless of the file format of the source text. Our translation management system is scalable and grows with your requirements. With the Across Language Server, you can create secure translation processes with a high degree of automation. -
45
Codeanywhere
Codeanywhere
Our Cloud IDE saves you time by deploying a development environment in seconds, enabling you to code, learn, build, and collaborate on your projects. With our amazing web-based code editor in Codeanywhere, you will forget you ever used any other code editor. All major programming languages fully supported, including JavaScript/TypeScript, PHP, Python, Ruby, Go, Java, C/C++, C# any many other. Intelligent editing features such as auto-complete, code refactor, go to definition, rename symbol and many others. Debug code with break points, call stacks and interactive console. Fully featured Git client. Expandable with vast amount of existing extensions. You can also spin up powerful containers in seconds, that can be fully preconfigured for the programming environment of your choice. Develop and run your code on our infrastructure with full sudo access. Prebuilt development environments for all major programming languages, packed with tools and database preinstalled.Starting Price: $2.50 per user per month -
46
Pine Script
TradingView
Pine Script® is TradingView’s programming language. It allows traders to create their own trading tools and run them on our servers. We designed Pine Script® as a lightweight, yet powerful, language for developing indicators and strategies that you can then backtest. Most of TradingView’s built-in indicators are written in Pine Script®, and our thriving community of Pine Script® programmers has published more than 100,000 community scripts. It’s our explicit goal to keep Pine Script® accessible and easy to understand for the broadest possible audience. Pine Script® is cloud-based and therefore different from client-side programming languages. While we likely won’t develop Pine Script® into a full-fledged language, we do constantly improve it and are always happy to consider requests for new features. Because each script uses computational resources in the cloud, we must impose limits in order to share these resources fairly among our users.Starting Price: Free -
47
LiteLLM
LiteLLM
LiteLLM is a versatile platform designed to streamline interactions with over 100 Large Language Models (LLMs) through a unified interface. It offers both a Proxy Server (LLM Gateway) and a Python SDK, enabling developers to integrate various LLMs seamlessly into their applications. The Proxy Server facilitates centralized management, allowing for load balancing, cost tracking across projects, and consistent input/output formatting compatible with OpenAI standards. This setup supports multiple providers. It ensures robust observability by generating unique call IDs for each request, aiding in precise tracking and logging across systems. Developers can leverage pre-defined callbacks to log data using various tools. For enterprise users, LiteLLM offers advanced features like Single Sign-On (SSO), user management, and professional support through dedicated channels like Discord and Slack.Starting Price: Free -
48
WildFly
WildFly
WildFly is a powerful, modular, & lightweight application server that helps you build amazing applications. Configuration in WildFly is centralized, simple and user-focused. The configuration file is organized by subsystems that you can easily comprehend and no internal server wiring is exposed. All management capabilities are exposed in a unified manner across many forms of access. These include a CLI, a web-based administration console, a native Java API, an HTTP/JSON based REST API, and a JMX gateway. These options allow for custom automation using the tools and languages that best fit your needs. It uses JBoss Modules to provide true application isolation, hiding server implementation classes from the application and only linking with JARs your application needs. Visibility rules have sensible defaults, yet can be customized. The dependency resolution algorithm means that classloading performance is not affected by the number of versions of libraries you have installed. -
49
Altair SLC
Altair
Many organizations have developed SAS language programs over the past 20 years that are vital to their operations. Altair SLC runs programs written in SAS language syntax without translation and without needing to license third-party products. Altair SLC reduces users’ capital costs and operating expenses thanks to its superb ability to handle high levels of throughput. Altair SLC's built-in SAS language compiler runs SAS language and SQL code, and utilizes Python and R compilers to run Python and R code and exchange SAS language datasets, Pandas, and R data frames. The software runs on IBM mainframes, in the cloud, and on servers and workstations running a variety of operating systems. It supports both remote job submission and the ability to exchange data between mainframe, cloud, and on-premises installations. -
50
Hitachi Streaming Data Platform
Hitachi
The Hitachi Streaming Data Platform (SDP) is a real-time data processing system designed to analyze large volumes of time-sequenced data as it is generated. By leveraging in-memory and incremental computational processing, SDP enables swift analysis without the delays associated with traditional stored data processing. Users can define summary analysis scenarios using Continuous Query Language (CQL), similar to SQL, allowing for flexible and programmable data analysis without the need for custom applications. The platform's architecture comprises components such as development servers, data-transfer servers, data-analysis servers, and dashboard servers, facilitating scalable and efficient data processing workflows. SDP's modular design supports various data input and output formats, including text files and HTTP packets, and integrates with visualization tools like RTView for real-time monitoring.