Alternatives to Kotlin
Compare Kotlin alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to Kotlin in 2026. Compare features, ratings, user reviews, pricing, and more from Kotlin competitors and alternatives in order to make an informed decision for your business.
-
1
Bitrise
Bitrise
Bitrise is a CI/CD platform built for mobile development, helping teams speed up builds, automate testing, and deliver high-quality apps faster. It supports native languages like Swift, Objective-C, Java, and Kotlin, as well as cross-platform frameworks including React Native, Flutter, Xamarin, Cordova, and Ionic. Setup takes minutes, with customizable workflows that adapt to any project. Bitrise integrates with GitHub, GitLab, and other industry-standard tools, while its cloud infrastructure removes the need for manual processes or maintenance overhead. Pipelines provide flexible structure for CI/CD, running tasks in parallel or sequentially to optimize efficiency. With access to the latest machines, up-to-date Xcode versions, and expert customer support, Bitrise offers a complete solution for mobile teams of any size. -
2
Ionic
Drifty
The Ionic Platform allows you to bring your apps to market faster with an integrated app platform built on the leading cross-platform mobile SDK. Build, secure, and deliver new mobile apps—and transform existing ones—across iOS, Android, and Web platforms from a single codebase. Full scalability—Grow from prototype to production to enterprise-scale, without having to think about capacity, reliability, or performance. Better apps, everywhere—Slash your development time and costs with a platform that lets you write once and deploy anywhere—iOS, Android, and Web. The core of the Ionic development experience is Ionic Capacitor, a cross platform native runtime that runs equally well on native iOS and Android mobile devices, as well as any web browser. The big difference is that, unlike traditional native development or cross-platform approaches, the UI of a Capacitor app runs primarily in the browser.Starting Price: Free -
3
C++
C++
C++ is a simple and clear language in its expressions. It is true that a piece of code written with C++ may be seen by a stranger of programming a bit more cryptic than some other languages due to the intensive use of special characters ({}[]*&!|...), but once one knows the meaning of such characters it can be even more schematic and clear than other languages that rely more on English words. Also, the simplification of the input/output interface of C++ in comparison to C and the incorporation of the standard template library in the language, makes the communication and manipulation of data in a program written in C++ as simple as in other languages, without losing the power it offers. It is a programming model that treats programming from a perspective where each component is considered an object, with its own properties and methods, replacing or complementing structured programming paradigm, where the focus was on procedures and parameters.Starting Price: Free -
4
Carbon Language
Google
Carbon Language: An experimental successor to C++. Performance matching C++ using LLVM, with low-level access to bits and addresses. Interoperate with your existing C++ code, from inheritance to templates. Fast and scalable builds that work with your existing C++ build systems. Solid language foundations that are easy to learn, especially if you have used C++. Easy, tool-based upgrades between Carbon versions. Safer fundamentals, and an incremental path towards a memory-safe subset. Carbon is fundamentally a successor language approach, rather than an attempt to incrementally evolve C++. It is designed around interoperability with C++ as well as large-scale adoption and migration for existing C++ codebases and developers.Starting Price: Free -
5
Dart
Dart Language
Mature and complete async-await for user interfaces containing event-driven code, paired with isolate-based concurrency. A programming language optimized for building user interfaces with features such as sound null safety, the spread operator for expanding collections, and collection if for customizing UI for each platform. Write code using a flexible type system with rich static analysis and powerful, configurable tooling. Target the web with complete, mature, fast compilers for JavaScript. Run backend code supporting your app, written using a single programming language. This collection is not exhaustive—it’s just a brief introduction to the language for people who like to learn by example. You might also want to check out the language and library tours, or the Dart cheatsheet codelab. -
6
Java
Oracle
The Java™ Programming Language is a general-purpose, concurrent, strongly typed, class-based object-oriented language. It is normally compiled to the bytecode instruction set and binary format defined in the Java Virtual Machine Specification. In the Java programming language, all source code is first written in plain text files ending with the .java extension. Those source files are then compiled into .class files by the javac compiler. A .class file does not contain code that is native to your processor; it instead contains bytecodes — the machine language of the Java Virtual Machine1 (Java VM). The java launcher tool then runs your application with an instance of the Java Virtual Machine.Starting Price: Free -
7
Jetpack Compose
Google
Jetpack Compose is Android’s recommended modern toolkit for building native UI. It simplifies and accelerates UI development on Android. Quickly bring your app to life with less code, powerful tools, and intuitive Kotlin APIs.Starting Price: Free -
8
Koin
Kotzilla
Koin simplifies DI and empowers developers in the Kotlin landscape. Koin helps you build any kind of Kotlin & Kotlin multiplatform application, from Android mobile to backend Ktor server applications. Koin is built for the most demanding apps and is trusted by developers worldwide. Koin is an open source dependency injection framework tailored for Kotlin developers. With its intuitive DSL and lightweight container, Koin simplifies dependency injection for any Kotlin application and SDK. Koin framework lets you build your dependency injection in a breeze, with simple API and Kotlin DSL. Koin can help you create complex Android mobile applications, so you can focus on your business, not your tools. Koin connects on top of the Kotlin ecosystem. Using the power of Kotlin, Koin provides easy dependency injection across multiple platforms. Already used by thousands of companies in the world, Koin is ready to scale in production.Starting Price: Free -
9
Codename One
Codename One
Codename One is an open-source cross-platform mobile app development framework to build native iOS, Android, Desktop & Web apps with a single Java or Kotlin codebase. It compiles Java or Kotlin into native code for iOS, Android, UWP (Universal Windows Platform), and even JavaScript (with seamless PWA and Thread support). It's a complete mobile platform featuring virtual machines, simulator, design tools (visual theme/builder/css), IDE integrations, ports to multiple OS's and much more. It provides full access to the underlying native OS code (e.g. Objective-C, C#, Dalvik/ART) through a portable abstraction which enables 100% code reuse. -
10
DexGuard
Guardsquare
Protecting Android applications and SDKs against reverse engineering and hacking. Android applications and SDKs are easy to decompile using readily available tools. This opens the way for various forms of abuse, including intellectual property theft, credential harvesting, tampering and cloning. DexGuard protects native Android and cross-platform apps and SDKs against reverse engineering and hacking. It hardens apps' code and enables them to defend themselves at runtime. DexGuard is a command-line tool that processes, optimizes and protects Android applications and libraries. It enables you to fully protect your application or SDK without requiring you to share or alter the source code. DexGuard offers built-in support for both native Android (Java, Kotlin) and cross-platform applications (Cordova, Ionic, React Native, Unity). DexGuard’s functionality can be extended with the NDK add-on to process and protect native libraries. -
11
ProGuard
Guardsquare
ProGuard: Open Source Optimizer for Java and Kotlin. ProGuard is the most popular optimizer for Java bytecode. ProGuard also provides minimal protection against reverse engineering by obfuscating the names of classes, fields and methods. ProGuard reduces the download and startup time of Android applications and improves their performance on mobile devices. ProGuard obfuscates Java applications and pre-verifies the processed code for Java Micro Edition and for Java 6 and higher. ProGuard optimizes and obfuscates Java applications for cell phones, Blu-ray players, set-top boxes and other constrained devices. ProGuard fully supports Java and Kotlin applications, enabling developers to take full advantage of these languages’ features without sacrificing performance or security. ProGuard is a command-line tool with an optional graphical user interface. ProGuard is fast: It processes small Android applications and entire runtime libraries in seconds. -
12
Tauri
Tauri
Tauri is a framework that enables developers to build small, fast, secure, cross-platform applications by combining existing web front-ends with Rust-powered back-ends. It supports any JavaScript framework, so you don’t need to change your stack and leverages each operating system’s native web renderer to deliver app footprints as low as 600 KB. Deep inter-process communication bridges your JavaScript UI, Rust core logic, and native Swift or Kotlin components for seamless integration with system APIs. Security is built in from the ground up, with Rust at its center and a team-driven focus on hardening and innovation. The CLI scaffolds new projects via Bash, PowerShell, npm, Yarn, pnpm, Deno, Bun, or Cargo, and includes tools for bundling, templating, and secure defaults, all accessible through a simple “create-tauri-app” command.Starting Price: Free -
13
Deeplearning4j
Deeplearning4j
DL4J takes advantage of the latest distributed computing frameworks including Apache Spark and Hadoop to accelerate training. On multi-GPUs, it is equal to Caffe in performance. The libraries are completely open-source, Apache 2.0, and maintained by the developer community and Konduit team. Deeplearning4j is written in Java and is compatible with any JVM language, such as Scala, Clojure, or Kotlin. The underlying computations are written in C, C++, and Cuda. Keras will serve as the Python API. Eclipse Deeplearning4j is the first commercial-grade, open-source, distributed deep-learning library written for Java and Scala. Integrated with Hadoop and Apache Spark, DL4J brings AI to business environments for use on distributed GPUs and CPUs. There are a lot of parameters to adjust when you're training a deep-learning network. We've done our best to explain them, so that Deeplearning4j can serve as a DIY tool for Java, Scala, Clojure, and Kotlin programmers. -
14
Javalin
Javalin
You never extend classes and you rarely implement interfaces. Javalin is just a few thousand lines of code on top of Jetty, and its performance is equivalent to raw Jetty code. Due to its size, it's very easy to reason about the source code. Other Java and Kotlin web frameworks usually offer one version for each language. Javalin is being made with inter-operability in mind, apps are built the same way in both Java and Kotlin. Javalin runs on top of Jetty, one of the most used and stable web servers on the JVM. You can configure the Jetty server fully, including SSL and HTTP3 and everything else that Jetty offers. Many lightweight Java and Kotlin web frameworks don't support OpenAPI, but Javalin does. -
15
Ktor
JetBrains
Create asynchronous client and server applications. Anything from microservices to multiplatform HTTP client apps in a simple way. Open Source, free, and fun! Ktor is built from the ground up using Kotlin and Coroutines. You get to use a concise, multiplatform language, as well as the power of asynchronous programming with an intuitive imperative flow. Ktor allows you to use only what you need, and to structure your application the way you need it. In addition, you can also extend Ktor with your own plugin very easily. Brought to you by JetBrains, creators of IntelliJ IDEA, Kotlin, and more. Ktor is not only used by our customers but also internally at JetBrains. In addition, you have top-notch tooling support! -
16
TotalCross
TotalCross
Less than 5MB of footprint, ensuring high performance even when running in low-end devices. Basic knowledge of Java or Kotlin lets you build performing Apps for Android, Linux Arm, Windows, and iOS. Code once and run on every platform. Responsive User Interfaces provide the same behavior and usability. Tecdet develops systems for traffic control and inspection for the Brazilian government. They decided to rebuild their system for the Linux Arm architecture compatible with Toradex modules and chose TotalCross to develop their GUI. -
17
EffectsSDK
EffectsSDK
EffectsSDK is a cross-platform AI-powered video enhancement SDK that enables developers and businesses to integrate real-time video effects and webcam enhancement features into their applications. Designed for video conferencing platforms, telehealth systems, streaming tools, educational platforms, presentation services, and communication software, EffectsSDK provides advanced AI-based effects such as background blur, virtual background replacement, intelligent auto-framing, AI denoise, skin smoothing, beautification, and cinematic color grading. The SDK operates in real time and is optimized for performance across Web, Windows, macOS, iOS, Android, and Linux environments, supporting technologies such as DirectX, OpenGL, Metal, OpenVINO, WinML, and CoreML with GPU acceleration. Developers can integrate the SDK into applications using C++, Objective-C, Kotlin, JavaScript, and WebAssembly-based wrappers depending on platform requirements.Starting Price: $125/month -
18
IntelliJ IDEA
JetBrains
IntelliJ IDEA is a professional-grade integrated development environment (IDE) primarily designed for Java and Kotlin development. It helps developers write code faster by automating routine tasks and providing smart coding assistance. The IDE supports the full software development lifecycle, from design and coding to testing and deployment. IntelliJ IDEA stays up to date with the latest language features, such as full support for Java 24 and Kotlin K2 mode. It offers a smooth and enjoyable workflow that helps developers stay focused and productive. The platform also emphasizes data privacy and security, complying with industry standards like SOC 2.Starting Price: $19.90 per user per month -
19
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. -
20
Koog
JetBrains
Koog is a Kotlin‑based framework for building and running AI agents entirely in idiomatic Kotlin, supporting both single‑run agents that process individual inputs and complex workflow agents with custom strategies and configurations. It features pure Kotlin implementation, seamless Model Control Protocol (MCP) integration for enhanced model management, vector embeddings for semantic search, and a flexible system for creating and extending tools that access external systems and APIs. Ready‑to‑use components address common AI engineering challenges, while intelligent history compression optimizes token usage and preserves context. A powerful streaming API enables real‑time response processing and parallel tool calls. Persistent memory allows agents to retain knowledge across sessions and between agents, and comprehensive tracing facilities provide detailed debugging and monitoring.Starting Price: Free -
21
Bootify
Bootify.io
Rapid application development for Spring Boot developers. Select your preferences (Maven/Gradle, Java/Kotlin, etc.), create your custom database model and download your runnable Spring Boot application. REST API with basic CRUD operations included and Best Practices applied. Get advanced feature in the professional plan, like integration tests with testcontainers or pagination support.Starting Price: $0 -
22
JHipster
JHipster
JHipster is a development platform to quickly generate, develop, and deploy modern web applications and microservice architectures. We support many frontend technologies, including Angular, React, and Vue. We even have mobile app support for Ionic and React Native! On the backend, we support Spring Boot (with Java or Kotlin), Micronaut, Quarkus, Node.js, and . NET. For deployment, we embrace cloud-native principles with Docker and Kubernetes. Deployment support exists for AWS, Azure, Cloud Foundry, Google Cloud Platform, Heroku, and OpenShift. Our goal is to generate a complete and modern web app or microservice architecture. A high-performance and robust server-side stack with excellent test coverage. A sleek, modern, mobile-first UI with Angular, React, or Vue + Bootstrap for CSS. A powerful workflow to build your application with Webpack and Maven or Gradle. Resilient microservice architecture with cloud-native principles in mind. -
23
MockK
MockK
Mocking is a technique to make testing code readable and maintainable. In three consequent articles, I would like to show the basics, features, and quirks of the MockK library. It is a new open-source library (github repository) focused on making mocking in Kotlin great. Injection first tries to match properties by name, then by class or superclass. Check the lookupType parameter for customization. Properties are injected even if private is applied. Constructors for injection are selected from the biggest number of arguments to lowest.Starting Price: Free -
24
Delphi
Embarcadero
Delphi is the ultimate IDE for creating cross-platform, natively compiled apps. Are you ready to design the best UIs of your life? Our award winning VCL framework for Windows and FireMonkey (FMX) visual framework for cross-platform UIs provide you with the foundation for intuitive, beautiful user interfaces that wow on every platform: Windows, macOS, iOS, and Android. Design your master UI layout once, then easily customize platform- and device-specific views without duplication of design effort. Drag-and-drop visual and non-visual components from the palette using our visual designer. Visually connect user interface elements to data sources using the LiveBindings Designer. Real-time design validation using Live On-Device Preview to broadcast the active form to multiple devices simultaneously. Add responsive design with resolution-aware components for desktop, tablets, and smartphones. Real, platform-specific native controls for an improved user experience. -
25
BaseRock AI
BaseRock AI
BaseRock.ai is an AI-driven software quality platform that automates unit and integration testing, enabling developers to generate and execute tests directly within their preferred IDEs. It leverages advanced machine learning models to analyze codebases, producing comprehensive test cases that ensure optimal code coverage and quality. By integrating seamlessly into CI/CD pipelines, BaseRock.ai facilitates early bug detection, reducing QA costs by up to 80% and boosting developer productivity by 40%. Its features include automated test generation, real-time feedback, and support for multiple programming languages such as Java, JavaScript, TypeScript, Kotlin, Python, and Go. BaseRock.ai offers flexible pricing plans, including a free tier, to accommodate various development needs. It is trusted by leading enterprises to enhance software quality and accelerate feature delivery.Starting Price: $14.99 per month -
26
Superwall
Superwall
Superwall is a mobile app subscription, paywall, and revenue-management platform that enables apps to build, test, deploy, and manage paywalls without code. It includes a drag-and-drop paywall editor with real-time previews; audience targeting to display personalized paywalls based on behavior or demographics; AB testing so different paywalls can be compared for conversion optimization; and campaign analytics to track revenue, subscriptions, user behavior, and entitlements all in one place. The tool supports SDKs in iOS (Swift), Android (Kotlin), Flutter, React Native, and Expo, enabling fast integration. It provides over 200 paywall templates that are fully editable (text, fonts, colors, images), and supports unlimited AB tests. Developers can set up different paywalls for different audience segments, control when and where paywalls display, and iterate quickly without needing app releases or complex deploys.Starting Price: $0.20 per conversion -
27
Kodika
Kodika
Startups, freelancers, SMEs, and designers are releasing new apps every day, either to stores or for internal use. Integrate with your WordPress, Joomla, Drupal, or custom CMS. Create your custom Food ordering app with accounts, cart, and payments. Build any app using +1000 ready-to-use code blocks. Create an app for your WooCommerce or Shopify app. Build your web radio or web tv app in minutes, by using our player plugin. Stand out with powerful web radio app features. Our ready-to-use web radio mobile apps are the perfect solution for you. Get a to-do app that suits you. Say goodbye to complex coding and embrace a simple, user-friendly app-building process. Stay informed of events, sermons, and more in one place. Listen to sermons and services on your mobile. Kodika generates native iOS and Android apps compiled in Swift and Kotlin, giving them the best compatibility with previous and next operating system versions and maximum performance.Starting Price: €14.90 per month -
28
Realm
Realm DB
Realm is a mobile-first, open source object database designed to run directly inside phones, tablets, and wearables. It provides a simple, object-oriented data model that eliminates the need for an ORM, allowing developers to define models as regular classes in languages like Swift, Java, Kotlin, C#, JavaScript, Dart, and C++. Realm's architecture ensures high performance and low memory usage by employing a zero-copy design, lazy loading, and multi-version concurrency control (MVCC) for thread-safe operations. It's live objects and collections automatically update across threads, enabling reactive programming patterns. Realm supports relationships between objects via links and backlinks, facilitating complex data structures. Developers can utilize tools like Realm Studio to inspect and manipulate local Realm databases and integrate Realm into various platforms, including React Native, Flutter, Xamarin, and Node.js.Starting Price: Free -
29
Android Studio
Android Studio
Android Studio provides the fastest tools for building apps on every type of Android device. Create complex layouts with ConstraintLayout by adding constraints from each view to other views and guidelines. Then preview your layout on any screen size by selecting one of various device configurations or by simply resizing the preview window. Find opportunities to reduce your Android app size by inspecting the contents of your app APK file, even if it wasn't built with Android Studio. Inspect the manifest file, resources, and DEX files. Compare two APKs to see how your app size changed between app versions. Install and run your apps faster than with a physical device and simulate different configurations and features, including ARCore, Google's platform for building augmented reality experiences. Write better code, work faster, and be more productive with an intelligent code editor that provides code completion for Kotlin, Java, and C/C++ languages. -
30
Intro
Intro
Intro automates search, screening and outreach, so you can spend your time interviewing qualified candidates. Talk to one of our experts about your targeting. Decide which candidates are contacted. You'll automatically get in touch through your own email. We scour the open web to find software engineers and other technical candidates. Java, .NET, Ruby, Python and other languages. React, Angular, Javascript, HTML, CSS, design and more. Broad skills and experience across the entire stack. Java, Kotlin and other languages for Android. Swift or Objective-C for iOS and other Apple devices. Experience from both development and operations. Our pricing is determined by how many positions you want to fill and how difficult they are. We always guarantee a certain amount of qualified, interested candidates. Being a consultant is not for everyone. We scan the open web to find candidates that suit you. Search and screening is (almost) completely automated. -
31
JetBrains Academy
JetBrains
Turn on the free educational features in your IDE to learn programming from scratch, expand your current skill set, or create your own interactive courses to share with others. With the JetBrains Academy plugin, you can learn and teach programming languages in the form of coding tasks and custom verification tests right inside JetBrains IDEs. Access over 100 courses in the most in-demand programming languages and technologies, and build real-world projects for your developer portfolio. Create your own courses by combining theoretical learning and hands-on practice. Test user knowledge with various sets of tasks, and provide extra assistance with feedback and hints. The JetBrains Academy plugin is free to use and supports Java, Kotlin, Python, Scala, JavaScript, Rust, C++, Go, and PHP with more languages to come. JetBrains Academy plugin is compatible with IntelliJ IDEA, PyCharm, WebStorm, Android Studio, CLion, GoLand, and PhpStorm.Starting Price: Free -
32
.NET
Microsoft
Free. Cross-platform. Open source. A developer platform for building all your apps. Build native apps for Android, iOS, macOS and Windows from a single codebase. You can write your .NET apps in C#, F#, or Visual Basic. Your skills, code, and favorite libraries apply anywhere you use .NET. You can learn more about what .NET can do with these free videos. .NET is open source and we are very thankful for the many contributions it receives from the community.Starting Price: Free -
33
FacePlugin
FacePlugin
Welcome to FacePlugin, the leading provider of fully On-Premises Identity Verification Solutions. Our robust suite of services includes state-of-the-art technologies such as Face Recognition, Face Liveness Detection, ID Document Recognition and Palm print recognition Our face recognition algorithm is super fast and unbiased. Our liveness detection model can detect spoofing attacks including printed photo, video replay, 3D masks and deepfake. Our ID document recognition solution can recognize ID documents from 180+ countries and it can recognize all kinds of ID documents including ID card, Passport and Driver License. SDKs we offer - Face recognition SDK (Android, iOS, Server) - Liveness detection SDK (Android, iOS, Server) - ID document recognition SDK (Android, iOS, Server) - Palmprint recognition SDK (Server) Programming languages: Python, Swift, Object C, Java, Kotlin, Flutter We provide free integration support.Starting Price: $0 -
34
Dyte
Dyte
Dyte's Video SDK and APIs are SOC 2, GDPR and HIPAA complaint. That lets you embed scalable, customisable and interactive video calls within minutes into your Web, Desktop or mobile apps. Collaborate efficiently with HD video, chat, screen sharing, whiteboard, emoji reactions, file sharing and everything a user packaged within one SDK. Dyte's Video Conferencing SDK & APIs are comfortable with React JS, Angular, JavascriptMobile: Flutter, Kotlin, Swift, React Native, Android, iOSDesktop, Electron. With an uptime of 99.99%, industry-leading documentation and out of the box plugins, customize the video experience for your ed-tech, tele-health, fitness, HR-tech, social or gaming platform. Use Dyte's SDKs to build fully custom video experiences powered by a robust infrastructure. With our out-of-the-box chat, plug-ins, recording, and several useful features, Dyte is an all-in-one SDK to help you take video collaboration to the next level. Dyte offers 10K free credits each monthStarting Price: $0 -
35
Bitdive
Bitdive
BitDive is a zero-code quality and test automation platform for Java, Kotlin, Spring Boot and other JVM-based applications that captures real executions and converts them into reusable, deterministic test scenarios you can replay in CI, staging or on a developer machine without writing or maintaining test code. BitDive runs as a lightweight library dependency and records full context from real traffic including HTTP/gRPC requests and responses, method calls, SQL queries with parameters and results, service interactions and timings, enabling deep method-level observability, distributed tracing, performance profiling and semantic drift detection. Its capture-replay-verify loop lets teams automatically generate regression suites and JUnit tests from actual executions, reproduce and debug production bugs locally with full execution chains, eliminate fragile mocks and flaky tests, and validate behavior changes before deployment. BitDive also visualizes service maps and heatmaps.Starting Price: Free -
36
.NET MAUI
Microsoft
.NET Multi-platform App UI (.NET MAUI) is a framework for building modern, multi-platform, natively compiled iOS, Android, macOS, and Windows apps using C# and XAML in a single codebase. .NET MAUI uses the latest, modern technologies for building native apps on Android, iOS, macOS, and Windows abstracting them into one common framework built on .NET 6. Native apps look and feel like the operating system on which they belong by default and layouts are fully adapted to each device automatically with no additional code. Platform APIs are available directly from C# to access over 60 platform features from a single cross-platform API including access to things like isolated storage, sensors, geolocation, camera, and a whole lot more with no compromises.Starting Price: Free -
37
Callstack.ai PR Reviewer
Callstack.ai
AI-powered pull request reviewer with deep contextual insights, tailored feedback, and one-click automated setup. Callstack.ai PR Reviewer saves you time and lowers error risk with automatic PR summaries, security & bug checks, and performance optimization suggestions. Automatic PR Summaries Understand code changes quickly with auto-generated summaries and diagram. Context-Aware Feedback Callstack.ai aligns with your team’s coding standards by understanding the core structure of your code for context-driven insights. Customizable Reviews Tailor Callstack.ai to provide feedback that aligns with your unique coding standards and requirements. Compatible with Major Programming Languages We currently support repositories written in the following languages: javascript, typescript, python, java, kotlin, php, go, ruby, rust, react & vue.Starting Price: $285/month (per 100 reviews) -
38
Scala
Scala
Scala combines object-oriented and functional programming in one concise, high-level language. Scala's static types help avoid bugs in complex applications, and its JVM and JavaScript runtimes let you build high-performance systems with easy access to huge ecosystems of libraries. The Scala compiler is smart about static types. Most of the time, you need not tell it the types of your variables. Instead, its powerful type inference will figure them out for you. In Scala, case classes are used to represent structural data types. They implicitly equip the class with meaningful toString, equals and hashCode methods, as well as the ability to be deconstructed with pattern matching. In Scala, functions are values, and can be defined as anonymous functions with a concise syntax.Starting Price: Free -
39
Vala
The GNOME Project
Vala is a programming language using modern high level abstractions without imposing additional runtime requirements and without using a different ABI compared to applications and libraries written in C. Vala uses the GObject type system and has additional code generation routines that make targeting the GNOME stack simple. Vala has many other uses where native binaries are required. More. There is GNOME Discourse for developer and general discussions. You can also join the Vala Matrix channel for asking questions and talking with the developers. Vala is a cross platform development tool with third party distributions providing binaries for Windows, macOS, Linux, BSDs and other platforms.Starting Price: Free -
40
Xamarin
Microsoft
Free. Cross-platform. Open source. An app platform for building Android and iOS apps with .NET and C#. Use .NET and C# to create native apps for the billions of Android, iPhone, iPad, Mac, and Windows devices around the world. Add to that sharing code with any .NET app, empowering you to be more productive and build apps faster than ever across all platforms. Ready to take code sharing to the next level? Xamarin.Forms is an open source mobile UI framework from Microsoft for building iOS, Android, & Windows apps with .NET from a single shared codebase. Whether you want a consistent look across platforms or prefer native look and feel, Xamarin.Forms will get you up and running in no time. .NET is a developer platform made up of tools, programming languages, and libraries for building many different types of applications. Xamarin extends the .NET developer platform with tools and libraries specifically for building apps for Android, iOS, tvOS, watchOS, macOS, and Windows. -
41
RKTracer
RKVALIDATE
RKTracer is a code-coverage and test-analysis tool that enables teams to assess the quality and completeness of their testing across unit, integration, functional, and system-level testing, without altering a single line of application code or build workflow. It supports instrumentation across host machines, simulators, emulators, embedded devices, and servers, and covers a broad array of programming languages, including C, C++, CUDA, C#, Java, Kotlin, JavaScript/TypeScript, Golang, Python, and Swift. It provides detailed coverage metrics such as function, statement, branch/decision, condition, MC/DC, and multi-condition coverage, and even supports delta-coverage reports to show which newly added or modified portions of code are already covered. Integration is seamless; simply prefix your build or test command with “rktracer”, run your tests, then generate HTML or XML reports (for CI/CD systems or dashboards like SonarQube). -
42
CoffeeScript
CoffeeScript
Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way. The golden rule of CoffeeScript is: “It’s just JavaScript.” The code compiles one-to-one into the equivalent JS, and there is no interpretation at runtime. You can use any existing JavaScript library seamlessly from CoffeeScript (and vice-versa). The compiled output is readable, pretty printed, and tends to run as fast or faster than the equivalent handwritten JavaScript. Most modern JavaScript features that CoffeeScript supports can run natively in Node 7.6+, meaning that Node can run CoffeeScript’s output without any further processing required. This list may be incomplete, and excludes versions of Node that support newer features behind flags; please refer to node.green for full details. You can run the tests in your browser to see what your browser supports.Starting Price: Free -
43
F#
F#
F# gives you simplicity and succinctness like Python with correctness, robustness and performance beyond C# or Java. F# is open source, cross-platform and free to use with professional tooling. F# is a JavaScript and .NET language for web, cloud, data-science, apps and more. Cloud computing relies on leveraging multiple integrated services. Using multiple services required a unique set of technologies and capabilities, and F# excels in this domain. With the recent rise of cloud solutions, it is becoming increasingly easy to deploy multiple services “in the cloud”, expanding what is possible both by storing large amounts of data and running heavy computations distributed across clusters of machines.Starting Price: Free -
44
LiteRT
Google
LiteRT (Lite Runtime), formerly known as TensorFlow Lite, is Google's high-performance runtime for on-device AI. It enables developers to deploy machine learning models across various platforms and microcontrollers. LiteRT supports models from TensorFlow, PyTorch, and JAX, converting them into the efficient FlatBuffers format (.tflite) for optimized on-device inference. Key features include low latency, enhanced privacy by processing data locally, reduced model and binary sizes, and efficient power consumption. The runtime offers SDKs in multiple languages such as Java/Kotlin, Swift, Objective-C, C++, and Python, facilitating integration into diverse applications. Hardware acceleration is achieved through delegates like GPU and iOS Core ML, improving performance on supported devices. LiteRT Next, currently in alpha, introduces a new set of APIs that streamline on-device hardware acceleration.Starting Price: Free -
45
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 -
46
Jmix
Haulmont Technology
Discover a rapid application development platform that supercharges your digital initiatives without low-code limitations, vendor dependency, and usage-based fees. Jmix general purpose open architecture based on a future-proof technology stack is capable to support various digital initiatives across the organization. Jmix applications are indeed yours and can be supported independently thanks to open-source runtime utilizing mainstream technologies. Your data is secure with a server-side frontend development model and fine-grained access control. Any Java or Kotlin developer is a full-stack Jmix developer - you don’t need separate backend and frontend teams. Visual tools help onboard developers who have little experience or move from an obsolete stack. Jmix’s data-centric approach and single development language make it a natural fit to migrate legacy applications. Jmix supercharges your team with high-productivity tools and ready-to-use components.Starting Price: $45 per month -
47
Ring
Ring
The Ring is a practical general-purpose multi-paradigm language. The supported programming paradigms are imperative, procedural, object-oriented, declarative using nested structures, functional, meta programming and natural programming. The language is portable (Windows, Linux, macOS, Android, WebAssembly, etc.) and can be used to create Console, GUI, Web, Games and Mobile applications. The language is designed to be simple, small and flexible. The language is simple, trying to be natural, encourage organization and comes with transparent and visual implementation. It comes with compact syntax and a group of features that enable the programmer to create natural interfaces and declarative domain-specific languages in a fraction of time. It is very small, flexible and comes with smart garbage collector that puts the memory under the programmer control. It supports many programming paradigms, comes with useful and practical libraries.Starting Price: Free -
48
Synergy DBL
Synergex
Synergy DBL is a proven, ANSI-standard business language with class libraries, a high-performance database, and .NET interoperability at the heart of the Synergy/DE product suite. Flexible and reliable, it gives you the power to create scalable, portable enterprise applications and supports both object-oriented and structured programming techniques. Synergy DBL comes in two forms: traditional Synergy DBL and Synergy DBL for .NET. Traditional Synergy DBL supports numerous open technologies (including XML, HTTPS, SSL, and ActiveX) that allow you to interface with third-party applications and data. The multi-pass Synergy DBL compiler supports strong prototyping and other strict error-detection features. Synergy DBL for .NET enables you to create Synergy libraries and applications that run natively in the .NET framework, then extend your applications by taking advantage of .NET Framework libraries and third-party controls and interoperating with applications written in other languages.Starting Price: Free -
49
Julia
Julia
Julia was designed from the beginning for high performance. Julia programs compile to efficient native code for multiple platforms via LLVM. Julia uses multiple dispatch as a paradigm, making it easy to express many object-oriented and functional programming patterns. The talk on the Unreasonable Effectiveness of Multiple Dispatch explains why it works so well. Julia is dynamically typed, feels like a scripting language, and has good support for interactive use. Julia provides asynchronous I/O, metaprogramming, debugging, logging, profiling, a package manager, and more. One can build entire Applications and Microservices in Julia. Julia is an open source project with over 1,000 contributors. It is made available under the MIT license.Starting Price: Free -
50
Thunkable
Thunkable
Web-based solution that helps businesses develop applications through component library, live tests, event blocks, and more. Design beautiful and powerful native apps on Thunkable without coding. Publish your app on Android, iOS, and the Web. Incubated at Google and MIT, backed by YCombinator. One project, three cross-platform apps, no coding. Add motion and smooth transitions to your app with lottie animations. On Thunkable, every app project is automatically created as a native Android app, native iOS app and mobile web app (on any platform), it's pretty magical. Start with a new project, or customize an existing sample app from our growing gallery of open sourced projects. Thunkable has an amazingly active and engaged community to help you with all your app building questions. We also offer live-chat support. Build your own apps by dragging and dropping your favorite components and connecting them together with blocks.Starting Price: $15/mo
