Open-source engine for Heroes of Might and Magic III
Zero Hour running natively on macOS, iPhone & iPad
Solar2D Game Engine main repository (ex Corona SDK)
3D modeler, 3D game maker, 3D demo maker
Urho3D Game engine
Character animation system for games and simulations.
Blueshift is a cross-platform 3D game engine implemented in C++
Realtime 3D engine for game development
A cross-platform OpenGL based lightweight scenegraph library