Browse free open source JavaScript Browsers and projects below. Use the toggles on the left to filter open source JavaScript Browsers by OS, license, language, programming language, and project status.

  • Try Google Cloud Risk-Free With $300 in Credit Icon
    Try Google Cloud Risk-Free With $300 in Credit

    No hidden charges. No surprise bills. Cancel anytime.

    Use your credit across every product. Compute, storage, AI, analytics. When it runs out, 20+ products stay free. You only pay when you choose to.
    Start Free
  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

    Deploy in 115+ regions with the modern database for every enterprise.

    MongoDB 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.
    Start Free
  • 1
    The PyJTF supports the test-driven development of Javascript code using tests written in Python. It executes the code under test in the IE environment under Windows (Win32). Allows greater productivity in testing Javascript code.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 2
    qtl is a FireFox extension for inline translating text.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 3

    RDFa Developer

    RDFa Developer project has been moved to BitBucket

    Firefox add-on that displays and checks RDFa. RDFa Developer project has been moved to BitBucket https://bitbucket.org/fundacionctic/rdfadev
    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    RESTBolt

    RESTBolt

    Browser WebExtension to work on http(s) requests

    ## Inspired by POSTMAN browser extension Add-on is based on [RESTMan](https://github.com/jsargiot/restman) Opera extension --- #### Note - Use a simple HTTP Request & Response Service to test WebExtension
    Downloads: 0 This Week
    Last Update:
    See Project
  • Gemini 3 and 200+ AI Models on One Platform Icon
    Gemini 3 and 200+ AI Models on One Platform

    Access Google's best plus Claude, Llama, and Gemma. Fine-tune and deploy from one console.

    Build generative AI apps with Vertex AI. Switch between models without switching platforms.
    Start Free
  • 5
    RJAX (Reverse aJAX) lets the web server push data to the browser. RJAX maintains an open connection between the browser and the server using an applet in the client page. The server can execute javascript commands directly on the client.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6
    React Performance Devtool

    React Performance Devtool

    A browser developer tool extension to inspect performance

    React Performance Devtool is a browser extension for inspecting the performance of React Components. It statistically examines the performance of React components based on the measures which are collected by React using window.performance API. Along with the browser extension, the measures can also be inspected in a console. A demo of the extension being used to examine the performance of React components on my website. Performance measures can also be logged to a console. With every re-render, measures are updated and logged to the console. To use this devtool extension, you'll need to register an observer in your app which will observe a collection of data (performance measures) over time. Registering an observer hooks an object containing information about the events and performance measures of React components to the window object, which can then be accessed inside the inspected window using eval().
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    Reactive Extensions for JavaScript

    Reactive Extensions for JavaScript

    An API for asynchronous programming with observable streams

    An API for asynchronous programming with observable streams. The Observer pattern done right. ReactiveX is a combination of the best ideas from. The Observer pattern, the Iterator pattern, and functional programming. ReactiveX is everywhere, and it's meant for everything. Available for idiomatic Java, Scala, C#, C++, Clojure, JavaScript, Python, Groovy, JRuby, and others. Embrace ReactiveX's asynchronicity, enabling concurrency and implementation independence. Manipulate UI events and API responses, on the Web with RxJS, or on mobile with Rx.NET and RxJava. Avoid intricate stateful programs, using clean input/output functions over observable streams. ReactiveX's operators often reduce what was once an elaborate challenge into a few lines of code. Traditional try/catch is powerless for errors in asynchronous computations, but ReactiveX is equipped with proper mechanisms for handling errors.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    The Recognizer is a web browser addon that detects and flags plagarized comments on Internet sites and highlights it as such for the user, including a link to the search that triggered the warning.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    Retrieve files from a remote computer using a PDA/Pocket PC running Windows Mobile. Can access remote computers regardless the geographical position. Can work under WiFi, GPRS or any other wireless networks.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Stop Storing Third-Party Tokens in Your Database Icon
    Stop Storing Third-Party Tokens in Your Database

    Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.

    Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
    Try Auth0 for Free
  • 10

    RemoveGooglePlusStuff

    Hide all Google+ stuff like the Google+ bar and the +You button.

    This Chrome/Chromium extension removes Google+ stuff like the Google+ bar in Google home page and the +You button in the same page.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11

    ReorJS

    Distributed Computing with JavaScript

    Create your own distributed computer that can distributed javascript based applications to any computer with a web browser, headless browser or node.js installation. For more information and updates please see our website - http://reorjs.com.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    The project is a port of the Mozilla Rhino JavaScript Interpreter (http://www.mozilla.org/rhino/) from Java/SE to J2ME/CLDC. The J2ME/CLDC port opens up the mobile world for scripting Java, as it is a widely used platform for mobile phone programming.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13

    RightClickMenu

    Right click menu jQuery plugin

    Attach a right-click menu to any DOM object using this jQuery plugin.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14

    Rikaisama (Legacy)

    Modification of Rikaichan with more features and customization options

    *** THIS ADD-ON IS NO LONGER SUPPORTED AND WILL NOT WORK WITH FIREFOX 57+ (however, it still works in Waterfox using a non-e10s window: "File > New Non-e10s Window") *** Rikaisama is a modification of the rikaichan Japanese-English popup dictionary that adds many features and customization options such as audio pronunciation, EPWING dictionary support, sanseido web dictionary support, word frequency, pitch accent, enhanced clipboard & save options, ability to create and add cards directly to an open Anki deck, "Super Sticky" mode, ability to remap shortcut keys, more fine-tuned startup options, and more. See http://rikaisama.sourceforge.net/ for more information. Supports Windows, Ubuntu, and newer versions of OSX.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    Robot Helper

    Robot Helper

    A browser WebExtension (beta) that generates test scripts

    # For automating test automation > A browser extension (beta) that generates test scripts ### Limitations - WebExtension only works on sites that allow content scripts. Add-on is based on - Robotcorder (https://github.com/sohwendy/Robotcorder) Additional features * Save test script * Syntax highlighting * Find script and jump to line * Added options to set the add-on Generate your RobotFramework Test Script via
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    The Rooster Teeth Site Extender is a Firefox Extension for the RT family of web sites. It provides additional functionality such as an advanced editor for posting, auto sign-in, and more.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    Instant Image Rotation can now be done on Firefox. RotateFox library is a pure Javascript library that implements all necessary Linear Algebra functions that are required for image rotation. RotateFox has done all mathematical jobs, no math knowledge is
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    A Firefox based browser plugin to add SAREST annotations. See http://www.w3.org/Submission/SA-REST/
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    Online booking system for trainings.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    SMART markItUp

    SMART markItUp

    completa el editor de posts y temas en Taringa! (Release 10/01/2019)

    Agrega los menus y opciones faltantes al editor de posts/temas en Taringa!. NOTA: La extension no es "perfectamente" funcional, se recomienda editar un post (o tema) en la vista avanzada y nunca simple.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21

    SVG editor for ownCloud

    Create and edit SVG graphics directly in ownCloud. Based on svg-edit.

    This project provides an ownCloud-app (http://apps.owncloud.com) for editing and creating SVG vector graphics in your browser. It's based on the awesome "svg-edit"-project (http://code.google.com/p/svg-edit/). Features like collaborative editing may be implemented later.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    A PHP-wrapper/"browser" for SVT TextTV with more advanced functions than the official page.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    SWFAddress is a small, but powerful library that provides deep linking for Flash and Ajax. It's a developer tool, allowing creation of unique virtual URLs that can point to a website section or an application state.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Sagleft's Elemental Browser

    Sagleft's Elemental Browser

    Compact, convenient internet browser.

    Convenient, fast and compact browser. Original design and speed. Relevant for owners of laptops and netbooks, as it is very compact and mobile viewer for internet sites.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Sarissa is a cross-browser ECMAScript lib that helps with browser incompatibilities in XMLHttpRequest/XML/XSLT/XPath along with some bonus utility methods. People call some of this Ajax nowdays, but the term was not available back in early 2003 ;-)
    Downloads: 0 This Week
    Last Update:
    See Project
MongoDB Logo MongoDB