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

The easy-to-use OpenStreetMap editor in JavaScript.

:tropical_fish: Babel is a compiler for writing next generation JavaScript.

One webpage for every book ever published!

:atom: The hackable text editor

Materialize, a CSS Framework based on Material Design

A terminal built on web technologies

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

Very spicy additions to the Java programming language.

Open source Slack-alternative in Golang and React - Mattermost

Open source Slack-alternative in Golang and React - Mattermost

A powerful cross-platform UI toolkit for building native-quality iOS, Android, and Progressive Web Apps with HTML, CSS, and JavaScript.

Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

Mist. Browse and use Ðapps on the Ethereum network.

Ruby on Rails

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

A refreshingly simple data-driven game engine built in Rust

Command-line JSON processor

Interactive Web Plotting for Python

sbt, the interactive build tool

A D3-based reusable chart library

A D3-based reusable chart library

Spring Security

Full Stack Web Framework in Python & JS. Used to build ERPNext

:leaves: JavaScript library for mobile-friendly interactive maps

Simplifies building hypermedia-driven REST web services on top of Spring Data repositories

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

A CMS for Static Site Generators

The world’s fastest framework for building websites.

🐜 A UI Design Language

PrestaShop offers a fully scalable open source ecommerce solution.

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

React components that implement Google's Material Design.

Simple collaboration from your desktop

React components that implement Google's Material Design.

Yoast SEO for WordPress

The OWASP ZAP core project

MODX Revolution - Content Management Framework

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

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

Run Kubernetes locally

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 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

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

🙃 A delightful community-driven (with 1800+ contributors) framework for managing your zsh configuration. Includes 300+ optional plugins (rails, git, OSX, hub, docker, homebrew, node, php, python, etc), 140+ themes to spice up your morning, and an auto-u

Point Cloud Library (PCL)

Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.

JRuby, an implementation of Ruby on the JVM

Swagger UI is a collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.