PyCAPGE - Python Classic Adventure Point and Click Game Engine
ReShade is a generic post-processing injector for games and videos.
A free 3D game engine to create games and realtimes scenes for Windows
Multi-threaded game engine for Android
3D .NET engine for Windows, Linux, Mac
Create symmetric sprites: browse, save to PC, or store online
Hungry Hero is an open source Flash game built on Starling Framework.