Gideros Release version
Desktop/Android/HTML5/iOS Java game development framework
Amateur 3D Game Engine
Game engine supporting many 3D/2D formats and graphic effects
One framework for creating powerful cross-platform games
A simple and easy-to-use library to enjoy videogames programming
High-efficiency minimalist C++ wrapper for OpenGL 4.3
Orx: Portable Game Engine
An isometric arcade-style game of skill, puzzles and exploration
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.
Cinema Enters Game Console
Modern 3D engine and IDE written using C# and C++.
Source code of the chapters of the book 3D Game Development with LWJGL
Portable game engine with main focus on point-and-click adventures
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Perl bindings to the Modern OpenGL API
3D .NET engine for Windows, Linux, Mac
Open Game Bootstrap
evolution for vegastrike SpaceSim/Combat/Trade game
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Mahasona engine is an open source game engine.
Cross-platform C framework very compact libraries and tools.
A generic 2D engine for any kind of game