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

Yoast SEO for WordPress

Official upstream development repository for Cabal and cabal-install

Jupyter Interactive Notebook

Yii 2: The Fast, Secure and Professional PHP Framework

IPFS implementation in go

SuiteCRM - Open source CRM for the world

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

Official repository for IPython itself. Other repos in the IPython organization contain things like the website, documentation builds, etc.

unix-like reverse engineering framework and commandline tools

Gitea: Git with a cup of tea

Entity Framework Core is a lightweight and extensible version of the popular Entity Framework data access technology

Distributed SQL query engine for big data

One framework for creating powerful cross-platform games.

Command-line program to download videos from YouTube.com and other video sites

Vim-fork focused on extensibility and usability

Repository for the Astropy core package

Cocos2d-x is a suite of open-source, cross-platform, game-development tools used by millions of developers all over the world.

Open Source, Distributed, RESTful Search Engine

Sentry is a cross-platform crash reporting and aggregation platform.

Optional static typing for Python 2 and 3 (PEP484)

Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.

Free and Open Source Web front-end resource CDN maintained by @PeterDaveHello

Bitcoin Core integration/staging tree

openFrameworks is a community-developed cross platform toolkit for creative coding in C++.

Main repository for GoCD - Continuous Delivery server

A JavaScript checker and optimizer.

Official Go implementation of the Ethereum protocol

:atom: The hackable text editor

A virtual machine for executing programs written in Hack.

:house_with_garden: Open-source home automation platform running on Python 3

Caffe: a fast open framework for deep learning.

A collection of easy-to-understand guides to programming tools

Zcash - Internet Money

K-9 Mail – Advanced Email for Android 📧

Scalable datastore for metrics, events, and real-time analytics

Liberating Web Analytics. Star us on Github? +1. Matomo is the leading open alternative to Google Analytics that gives you full control over your data. Matomo lets you easily collect data from websites, apps & the IoT and visualise this data and extract i

a package manager for javascript

Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.