XNA based game engine completely written in c#
Gives agents personality, moods, emotions and emotional attachments.
Cross-platform C framework very compact libraries and tools.
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
Multimedia asset management and manipulator for Étoilé
Cross platform Game Creation Software
Engines for Batch Games
A generic 2D engine for any kind of game
a game library to develop audio games
A 2D Adventure Game & Engine
3D Game engine
Multi-threaded 2D Renderer licensed under the Mozilla Public License
C++ game libraries plus server.
multi-kinect system
A 2D game engine base on OpenGL and SDL,support for Windows & Linux
Library for creating turn-based games with simultaneous moves.
TurboSphere is an easy to learn and powerful JS based game engine.
C++ Framework for slot machine games