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

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

The Swift Programming Language

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.

ClickHouse is a free analytics DBMS for big data

ClickHouse is a free analytic DBMS for big data.

G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)

Compatibility tool for Steam Play based on Wine and additional components

Nix, the purely functional package manager

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

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

An Open Source Machine Learning Framework for Everyone

🍃 Organic Maps is a free Android & iOS offline maps app for travelers, tourists, hikers, and cyclists. It uses crowd-sourced OpenStreetMap data and is developed with love by MapsWithMe (MapsMe) founders and our community. No ads, no tracking, no data coll

Notepad++ official repository

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

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

Open Source Computer Vision Library

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

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

Official doxygen git repository

PX4 Autopilot Software

PX4 Autopilot Software

Cloud-native high-performance edge/middle/service proxy

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

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.

An open source re-implementation of RollerCoaster Tycoon 2 🎢

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

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

Audio Editor

A library that provides an embeddable, persistent key-value store for fast storage.

Cross-platform music production software

Convert HTML to PDF using Webkit (QtWebKit)

The open-source database for the realtime web.

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 C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)

Caffe: a fast open framework for deep learning.

Zcash - Internet Money

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

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

A powerful cross-platform raw photo processing program

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.

:electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS

Space exploration, trading, and combat game.

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

🥑 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.