OpenSCAD - The Programmers Solid 3D CAD Modeller

The user-friendly command line shell.

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Open Source Routing Machine - C++ backend

Bitcoin Core integration/staging tree

Trust & Safety tools for working together to fight digital harms.

Cyan Worlds's Plasma game engine

PowerDNS Authoritative, PowerDNS Recursor, dnsdist

Flexible level editor

GemRB is a portable open-source implementation of Bioware’s Infinity Engine.

QGIS is a free, open source, cross platform (lin/win/mac) geographical information system (GIS)

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

This is the Official source code repository of the Synfig project

a cross-platform, terminal-based music player, audio engine, metadata indexer, and server in c++

⚔️ A cross-platform, open source, and super fast MUD client with scripting in Lua

A lightweight, fast and extensible game server for Minecraft

Kodi is an award-winning free and open source home theater/media center software and entertainment hub for digital media. With its beautiful interface and powerful skinning engine, it's available for

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