Extremely hard-core lander game.
Multi-platform game engine similar to old Megaman with a stage editor
A public domain cross platform 3D game
Gaming library
starcraft clone game
2D game engine for traditional platform games
a very lightweight advanced terrain-rendering and 3D map rendering sys
plugin-based RPG manager in C++ and Qt5
A C++ 3D game engine.
A free and open 3d action game.
3D Game Engine
Paintown is a 2d fighting game engine.
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Engine for games like's а Tyrian with random level generation.
Mahasona engine is an open source game engine.