Mahasona engine is an open source game engine.
Engines for Batch Games
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
Java decentralized cross-platform network multiplayer game engine
XNA based game engine completely written in c#
Built to be ease of use, with no programming knowledge, Multi-platform
Simple, component-based game engine based on Ogre and PolyVox,
Educational framework for OpenGLES, OpenCL and OpenAL
Create 2D mini-game easily with this lib
Free strategy browsergame engine.
Multimedia asset management and manipulator for Étoilé
Cross-platform C framework very compact libraries and tools.
C++ game libraries plus server.
A 2D Adventure Game & Engine
A generic 2D engine for any kind of game
A basic 3D environment with a first-person POV
Small OpenGL based game enegine
Multi-threaded 2D Renderer licensed under the Mozilla Public License
2D XNA Game Engine
3D Game engine
Library for creating turn-based games with simultaneous moves.
Modular Gaming Open Source Persistent Browser Based Game Framework
A 2D game engine base on OpenGL and SDL,support for Windows & Linux
TurboSphere is an easy to learn and powerful JS based game engine.