3D Game Engine
Mahasona engine is an open source game engine.
Open Source 3D Game Engine
Visual Novel engine, editor and game development.
3D game engine for C and C++
A truly extensible cross-platform game engine
A very small multi-platform game engine for creating desktop games.
Java Client + JS/Canvas Server-Side System, with maintained Objects
SDL game engine made for Ludum Dare 24
OSGET is the first open source mobile game engine template.
A cross platform 3d c++ game engine
Game engine supporting many 3D/2D formats and graphic effects
Free MMORPG Engine. Develop and host graphical browser-based games.
Cross-platform 2D gaming middleware
Zap Engine