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

YugaByteDB is a high-performance, transactional database for building distributed cloud services. It currently supports Redis API (as a true DB), Cassandra API and SQL is coming very soon.

The Swift Programming Language

ClickHouse is a free analytics DBMS for big data

Compatibility tool for Steam Play based on Wine and additional components

An Open Source Machine Learning Framework for Everyone

Nix, the purely functional package manager

Notepad++ official repository

Algorithms that run our universe | Your personal library of every algorithm and data structure code that you will ever encounter

Complete Open Source and Modular solution for MMO

MuseScore is an open source and free music notation software. For support, contribution, bug reports, visit MuseScore.org. Fork and make pull requests!

Animated sprite editor & pixel art tool (Windows, macOS, Linux)

Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.

Audio Editor

The new Windows Terminal and the original Windows console host, all in the same place!

This is the official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler. Issues are managed on our own bug tracker at https://www.freecadweb.org/tracker

ClickHouse is a free analytic DBMS for big data.

Cocos2d-x is a suite of open-source, cross-platform, game-development tools utilized by millions of developers across the globe. Its core has evolved to serve as the foundation for Cocos Creator 1.x & 2.x.

Mixxx is Free DJ software that gives you everything you need to perform live mixes.

TrinityCore Open Source MMO Framework (master = 7.3.5.26124, 3.3.5 = 3.3.5a.12340)

Godot Engine – Multi-platform 2D and 3D game engine

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Gazebo classic. For the latest version, see https://github.com/gazebosim/gz-sim

Official doxygen git repository

Cross-platform music production software

Convert HTML to PDF using Webkit (QtWebKit)

A PSP emulator for Android, Windows, Mac and Linux, written in C++. Want to contribute? Join us in #ppsspp on freenode (IRC) or just send pull requests / issues. For discussion use the forums on ppsspp.org.

The open-source database for the realtime web.

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

Multi Theft Auto is a game engine that incorporates an extendable network play element into a proprietary commercial single-player game.

Memory hacking library for Dwarf Fortress and a set of tools that use it

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

A powerful cross-platform raw photo processing program

Space exploration, trading, and combat game.

🥑 ArangoDB is a native multi-model database with flexible data models for documents, graphs, and key-values. Build high performance applications using a convenient SQL-like query language or JavaScript extensions.

Flexible level editor

A flexible level editor

BizHawk is a multi-system emulator written in C#. BizHawk provides nice features for casual gamers such as full screen, and joypad support in addition to full rerecording and debugging tools for all system cores.