XNA based game engine completely written in c#
Engines for Batch Games
Create 2D mini-game easily with this lib
Educational framework for OpenGLES, OpenCL and OpenAL
Free strategy browsergame engine.
Multimedia asset management and manipulator for Étoilé
Cross-platform C framework very compact libraries and tools.
A 2D Adventure Game & Engine
A generic 2D engine for any kind of game
AutoTeach makes kids study and learn in exchange for internet access.
Small OpenGL based game enegine
A basic 3D environment with a first-person POV
3D Game engine
Multi-threaded 2D Renderer licensed under the Mozilla Public License
2D XNA Game Engine
Library for creating turn-based games with simultaneous moves.
TurboSphere is an easy to learn and powerful JS based game engine.
A 2D game engine base on OpenGL and SDL,support for Windows & Linux
Take the chess graphism, and use it with a chess engine.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
A multiplatform game engine for interactive fiction experiences