Help out your favorite open source projects and become a better developer while doing it.

Ruby on Rails

The easy-to-use OpenStreetMap editor in JavaScript.

A JavaScript checker and optimizer.

Very spicy additions to the Java programming language.

Build amazing native and progressive web apps with open web technologies. One app running on everything 🎉

🎥 Command line video player

Main repository for the Sphinx documentation builder

turn natural language into structured data

💬 Open source machine learning framework to automate text- and voice-based conversations: NLU, dialogue management, connect to Slack, Facebook, and more - Create chatbots and voice assistants

Mist. Browse and use Ðapps on the Ethereum network.

The pytest framework makes it easy to write small tests, yet scales to support complex functional testing

Materialize, a CSS Framework based on Material Design

A terminal built on web technologies

Magic Another Game Engine

Multi Theft Auto is a game engine that adds full network multiplayer functionality to Rockstar North's Grand Theft Auto game series, in which this functionality is not originally found.

Interactive Web Plotting for Python

Cross-platform HTTP and GraphQL Client

Research platform for new language concepts and compiler technologies for Scala.

An experimental Rust compiler front-end for IDEs

Real-time performance monitoring, done right! https://my-netdata.io/

Replacement icons for popular apps in the style of macOS Big Sur

Spring Security

KeePassXC is a cross-platform community-driven port of the Windows application “Keepass Password Safe”.

A secure JavaScript/TypeScript runtime built with V8, Rust, and Tokio

Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a comma

A D3-based reusable chart library

A D3-based reusable chart library

A community-driven Emacs distribution - The best editor is neither Emacs nor Vim, it's Emacs *and* Vim!

A delightful community-driven (with 1,000+ contributors) framework for managing your zsh configuration. Includes 200+ optional plugins (rails, git, OSX, hub, capistrano, brew, ant, php, python, etc), over 140 themes to spice up your morning, and an auto-u

The OWASP ZAP core project

Simple collaboration from your desktop

Command-line JSON processor

One webpage for every book ever published!

📦🚀 Blazing fast, zero configuration web application bundler

sbt, the interactive build tool

fabric8 is an open source microservices platform based on Docker, Kubernetes and Jenkins

The world’s fastest framework for building websites.

Ceph is a distributed object, block, and file storage platform

JRuby, an implementation of Ruby on the JVM

:leaves: JavaScript library for mobile-friendly interactive maps

Point Cloud Library (PCL)

🐜 A UI Design Language

Open-source software for volunteer computing and grid computing.

E2E test framework for Angular apps

A collection of Android libraries to build browsers or browser-like applications.

Yoast SEO for WordPress

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

Dubbo is a high-performance, java based, open source RPC framework

React components that implement Google's Material Design.