Create custom themes for the Nintendo Switch
The game engine for everyone
Widelands is a free, open source real-time strategy game
UZDoom is a feature centric port for all Doom engine games
Desktop/Android/HTML5/iOS Java game development framework
A tool for recompiling Xbox 360 games to native executables
JK's Save Manager Switch Edition
An open source re-implementation of RollerCoaster Tycoon 2
3D Game engine with editor
Doom-based AI research platform for reinforcement learning
A multi core friendly rigid body physics and collision detection lib
Voxel game engine in C++ with OpenGL
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Flexible level editor
Botcraft is a cross-platform C++ library to create bots
FlightGear Flight Simulator: free open-source multiplatform flight sim
Ag is a fast, scriptable anagram generator.
Cross-breeding a 3D FPS with a fantasy RPG in the world of Hexen
0 A.D. is a free, open-source, cross-platform real-time strategy game.
Action RPG that's easy to mod
3D modeler, 3D game maker, 3D demo maker
Another clone of Rick Dangerous classic game
RTSish Game Engine
Orx: Data-Driven Game Engine