One framework for creating powerful cross-platform games
Desktop/Android/HTML5/iOS Java game development framework
Gideros Release version
Game engine supporting many 3D/2D formats and graphic effects
Amateur 3D Game Engine
Vivid3D is an open-source 3D engine with powerful 2D UI.
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Modern 3D engine and IDE written using C# and C++.
Source code of the chapters of the book 3D Game Development with LWJGL
3D .NET engine for Windows, Linux, Mac
Open Game Bootstrap
Gives agents personality, moods, emotions and emotional attachments.
Cross-platform C framework very compact libraries and tools.
Open Source Virtual World and MMOG Development Platform
A cross-platform OpenGL based lightweight scenegraph library
A cross platform 3d c++ game engine
A small Game Engine project.