Open Source JavaScript Software - Page 43
Sort By:
JavaScript Software
Browse free open source JavaScript Software and projects below. Use the toggles on the left to filter open source JavaScript Software by OS, license, language, programming language, and project status.
-
Full-stack observability with actually useful AI | Grafana CloudBuilt on open standards like Prometheus and OpenTelemetry, Grafana Cloud includes Kubernetes Monitoring, Application Observability, Incident Response, plus the AI-powered Grafana Assistant. Get started with our generous free tier today.
-
MongoDB Atlas runs apps anywhereMongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
-
1
LLM Datasets
Curated list of datasets and tools for post-training
LLM Datasets curates and standardizes datasets commonly used to train and fine-tune large language models, reducing the overhead of hunting down sources and normalizing formats. The repository aims to make datasets easy to inspect and transform, with scripts for downloading, deduping, cleaning, and converting to formats like JSONL that slot into training pipelines. It highlights instruction-tuning and conversation-style corpora while also pointing to code, math, or domain-specific sets for targeted capabilities. Quality is a recurring theme: examples and utilities help filter low-value samples, enforce length limits, and split train/validation consistently so results are comparable. Licensing and provenance are surfaced to encourage compliant usage and to guide dataset selection in commercial settings. For practitioners, the repo is a practical “starting pantry” that accelerates experimentation and helps keep data wrangling from dominating the project timeline. -
2
LaTeX.js
JavaScript LaTeX to HTML5 translator
This is a LaTeX to HTML5 translator written in JavaScript using PEG.js. latex.js for LaTeX is similar in spirit to marked for Markdown. LaTeX.js tries to be absolutely and uncompromisingly exact and compatible with LaTeX. The generated HTML is exactly what is meant to be output, down to the last space. The CSS makes it look like LaTeX output—except where impossible in principle, see limitations. -
3
Lerna
A tool for managing JavaScript projects with multiple packages
Lerna is a tool for managing JavaScript projects with multiple packages. Many times splitting a large codebase into several independently versioned packages is necessary for code sharing. However, this can make testing and tracking changes across repositories quite difficult. As a solution to this, many projects organize their codebases into multi-package repositories. It is Lerna's job to manage these multi-package repositories, optimizing workflow and reducing the time and space requirements for numerous copies of packages in development and build environments. Lerna's primary functionalities are bootstrap, which links dependencies in the repo together; and publish, which helps publish any updated packages. It is important to note that Lerna is not a deployment tool for serverless monorepos. -
4
List.js
Library for adding search, sort, filters and flexibility to tables
Tiny, invisible and simple, yet powerful and incredibly fast vanilla JavaScript that adds search, sort, filters and flexibility to plain HTML lists, tables, or anything. List.js can be used in three different ways. It can be on existing HTML, it can create it's own HTML or a combination of both methods. Works both lists, tables and almost anything else. E.g. <div>,<ul>,<table>, etc. Simple templating system that adds possibility to add, edit, remove items. Perfect library for adding search, sort, filters and flexibility to tables, lists and various HTML elements. Built to be invisible and work on existing HTML. Simple and invisible. Easy to apply to existing HTML. No dependencies. Fast, and tiny (5KB minified&gzip). It can handle thousands of items. It is easy to add search input and sort buttons with just a few classes and attributes in your HTML. ‘Automagical’ because List.js registers the event handlers, searches/sorts and updates the list for you. -
Try Google Cloud Risk-Free With $300 in CreditUse your credit across every product. Compute, storage, AI, analytics. When it runs out, 20+ products stay free. You only pay when you choose to.
-
5
Luna
Manage npm dependencies through a modern UI
Manage npm dependencies through a modern UI. npm desktop manager for handling npm dependencies. Supported platforms: OS X Windows and Linux. Luna was created with the main purpose to provide a flexible and modern UI for npm dependencies management. You can install, update and uninstall packages using a user interface built on the latest web technologies. Filter packages by name, group, and outdated. Preview package details (versions, statistics, dependencies, and more). Get notifications for missing dependencies or extraneous packages. The IO Management, Business Logic Management and Predictable Application State Management processors (middlewares) are subscribers of the application action stream. The IO Management and Business Logic Management are consumers and producers of actions. -
6
MCP Server and GW
An MCP stdio to HTTP SSE transport gateway with example server
mcp-server-and-gw is a Model Context Protocol (MCP) gateway that bridges standard input/output to HTTP Server-Sent Events (SSE) transport. It includes an example MCP server and client, facilitating the development and testing of MCP implementations. This tool is particularly useful for integrating MCP servers with applications like Claude Desktop that may not natively support remote server connections. -
7
MSON
Generate an app from JSON
The MSON compiler allows you to generate apps from JSON. The ultimate goal of MSON is to allow anyone to develop software visually, but you can also use pieces of MSON to turbo charge your development. MSON is a subset of JSON and comprised of just a few building blocks, yet it is as powerful as its non-declarative counterparts. MSON supports validation, inheritance, composition, pub/sub, access control, templating and various other features. MSON is particularly useful in software that generates other software, e.g. a form builder. This is because MSON is just JSON, so it is easy to consume, modify and store. MSON is framework agnostic, but the default mson-react rendering layer uses React and Material-UI to generate a UI. The rendering layer is pluggable and can be written to support any framework and UI library. The MSON library can also be used without any UI dependecies, which makes it great for things like data validation in both the front and back ends. -
8
Machine Learning Systems
Introduction to Machine Learning Systems
Machine Learning Systems is an open educational repository that serves as the source and learning stack for the Machine Learning Systems textbook, a project focused on teaching how to engineer AI systems that work reliably in real-world environments. Rather than concentrating only on model training, the material emphasizes the broader discipline of AI engineering, covering efficiency, reliability, deployment, and evaluation across the full lifecycle of intelligent systems. The repository includes textbook content, supporting labs, and companion tools such as TinyTorch to help learners move from theory to hands-on experimentation. Its mission is to establish AI systems engineering as a foundational discipline alongside traditional software and computer engineering. The project is structured to guide users through reading, building, and deploying workflows, including running labs on edge devices like Arduino and Raspberry Pi. -
9
Magda
A federated data catalog for all your big and small data
Magda is an open-source data catalog system designed to make datasets easier to find, access, and use. Built for government and enterprise use, it supports harvesting metadata from multiple sources, managing data access policies, and integrating with data APIs. Magda is highly customizable and ideal for building open data portals or internal data discovery tools. -
Gemini 3 and 200+ AI Models on One PlatformBuild generative AI apps with Vertex AI. Switch between models without switching platforms.
-
10
MagicMirror²
Modular smart mirror platform with a list of installable modules
MagicMirror² is Open Source, free and maintained by a big group of enthusiasts. Got a nice idea? Send us a pull request and become a part of the big list of contributors. The core of MagicMirror² contains a strong API which allows 3rd party developers to build additional modules. Modules you can use. Modules you can develop. Read our extensive documentation to find out everything you want to know about the MagicMirror² project. The full API description allows you to build your own modules. On the forum you will find a big list of MagicMirror² enthusiasts. Share your ideas, ask your questions and get support. The perfect place for you to start. MagicMirror² has an extensively documentated API. It allows you to built your own module backed by a powerful backend. Check out the API documentation for more information and start developing today. -
11
MailDev
Web Interface for viewing and testing emails during development
MailDev is an SMTP server with a web interface designed for viewing and testing emails during development. It allows developers to inspect and debug emails sent from their applications without delivering them to real inboxes. -
12
Marpit
The skinny framework for creating slide deck from Markdown
Marpit /mɑːrpɪt/ is the skinny framework for creating slide deck from Markdown. It can transform Markdown and CSS theme(s) to slide deck composed of static HTML and CSS and create a web page convertible into slide PDF by printing. Marpit is designed to output minimum assets for the slide deck. You can use the bare assets as a logicless slide deck, but mainly we expect to integrate output with other tools and applications. -
13
MasterLab
No-code/low-code workflow automation
MasterLab is a no-code/low-code workflow automation and data integration platform that helps users design backend logic visually. It enables the creation of APIs, database operations, and process automation without writing code. MasterLab is designed for startups and teams that need to prototype and iterate quickly. -
14
Matter
Material Design Components in Pure CSS
Material Design Components in Pure CSS. Materializing HTML at just one class per component. -
15
Mavo
Create web applications entirely by writing HTML and CSS
Create complex, reactive, persistent web applications by just writing HTML & CSS, without a single line of JavaScript and no server backend. Developed in the Haystack Group at MIT CSAIL and led by Lea Verou. Mavo extends the syntax of HTML to describe Web applications that manage, store, and transform data. Store data in the cloud, locally, or not at all by just changing an HTML attribute. Edit data right on the website, with an intuitive, auto-generated, customizable interface. No more wrestling with CMSes and servers! Multimedia uploads to your page via drag & drop, pasting, or browsing, without a single line of code. Perform calculations right in the HTML, that update when needed. No need to write JavaScript! Mavo uses familiar HTML-based syntax and can be used even by people with no programming experience. This is not wishful thinking; it’s published, peer-reviewed research. -
16
Maye
Maye a concise and small quick start tool
MayeIt is a small, simple, and easy-to-use quick-start tool. Don't look at the small size, its functions are still very diverse, such as multi-document drag and add start, fast key out, automatic multi-layer display, lnk file analysis, etc. The software has no complicated functions, and no garbage files will be generated during operation. Green is free of pollution. It only focuses on the rapid start of the file. It is a good helper for users to improve the operating experience of Windows. -
17
MediumEditor
A Medium.com WYSIWYG editor clone. A simple inline editor toolbar
This is a clone of medium.com inline editor toolbar. MediumEditor has been written using vanilla JavaScript, no additional frameworks required. MediumEditor also supports textarea. If you provide a textarea element, the script will create a new div with contentEditable=true, hide the textarea and link the textarea value to the div HTML content. People have contributed wrappers around MediumEditor for integrating with different frameworks and tech stacks. Take a look at the list of existing Wrappers and Integrations that have already been written for MediumEditor! Options to customize medium-editor are passed as the second argument to the MediumEditor constructor. The toolbar for MediumEditor is implemented as a built-in extension which automatically displays whenever the user selects some text. The toolbar can hold any set of defined built-in buttons, but can also hold any custom buttons passed in as extensions. -
18
Melt UI
A set of headless, accessible component builders for Svelte
Melt UI is an open-source headless component builder library created specifically for the Svelte ecosystem, designed to help developers construct accessible and highly customizable user interface components. Rather than providing fully styled widgets, the library focuses on supplying the behavioral logic and accessibility patterns needed to build UI components while allowing developers to control the visual appearance. Melt UI introduces a builder-based architecture where component logic is encapsulated in reusable primitives that can be attached to any HTML element or custom component. The project strongly emphasizes accessibility and follows WAI-ARIA standards to ensure consistent keyboard navigation and screen reader compatibility. It also integrates seamlessly with SvelteKit and TypeScript, making it suitable for modern web development workflows. -
19
Meow
CLI app helper
Meow is a CLI helper library for Node.js that simplifies the creation of command-line applications by parsing arguments and providing a user-friendly interface. -
20
Mercurius
Implement GraphQL servers and gateways with Fastify
Mercurius is a GraphQL adapter for Fastify. Caching of query parsing and validation. Automatic loader integration to avoid 1 + N queries. Just-In-Time compiler via graphql-jit. Federation support via @mercuriusjs/federation, including Subscriptions. Gateway implementation via @mercuriusjs/gateway, including Subscriptions. Batched query support. Customisable persisted queries. -
21
MetaMask Browser Extension
The MetaMask browser extension enables browsing Ethereum blockchain
A crypto wallet & gateway to blockchain apps. Start exploring blockchain applications in seconds. Trusted by over 30 million users worldwide. Available as a browser extension and as a mobile app, MetaMask equips you with a key vault, secure login, token wallet, and token exchange—everything you need to manage your digital assets. MetaMask provides the simplest yet most secure way to connect to blockchain-based applications. You are always in control when interacting on the new decentralized web. MetaMask generates passwords and keys on your device, so only you have access to your accounts and data. You always choose what to share and what to keep private. MetaMask provides an essential utility for blockchain newcomers, token traders, crypto gamers, and developers. Over a million downloads and counting! -
22
Metro
The JavaScript bundler for React Native
Metro aims for sub-second reload cycles, fast startup and quick bundling speeds. Works with thousands of modules in a single application. Supports every React Native project out of the box. Instead of creating the full server, create a Connect middleware that answers to bundle requests. This middleware can then be plugged into your own servers. The port parameter is optional and only used for logging purposes. The onBundleBuilt function is optional, is passed the bundle name, and is called when the server has finished creating the bundle. Starts a full Metro HTTP server. It will listen on the specified host port, and can then be queried to retrieve bundles for various entry points. If the secureServerOptions family of options are present, the server will be exposed over HTTPS. -
23
Mocha
A feature-rich JavaScript test framework running on Node.js
Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases. Hosted on GitHub. Mocha runs in the browser. Every release of Mocha will have new builds of ./mocha.js and ./mocha.css for use in the browser. Mocha is the most-depended-upon module on npm and Mocha is an independent open-source project, maintained exclusively by volunteers. Given Mocha’s use of function expressions to define suites and test cases, it’s straightforward to generate your tests dynamically. No special syntax is required — plain ol’ JavaScript can be used to achieve functionality similar to “parameterized” tests, which you may have seen in other frameworks. -
24
Monero Webminer
Javascript monero webminer
Html & Js code that allows Mining of XMR (Monero) on browsers. -
25
Movim
Movim - Decentralized social platform
Chatrooms, blogs, video conferences; Movim centralizes all you need to communicate with your colleagues, friends or family in one simple interface. It also fully adapts to all your devices from your smartphone to your desktop computer. Movim relies on the XMPP standard and therefore allows you to exchange with many other clients on all devices such as Conversations (Android) or Dino (Desktop). You can easily access and explore the content of the whole network and connect with all other Movim users instantly.
