Desktop/Android/HTML5/iOS Java game development framework
Cross-Platform C++ 2D/3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Gideros Release version
3D Procedural Game Engine Using OpenGL
2D game development library for Ruby and C++
A modern, cross-platform Quake game engine based on FitzQuake.
3D Engine c++
A cross-platform port of Hexen II game.
GemRB is a portable open-source implementation of the Infinity Engine
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
LDraw™ editor for LEGO® style digital building instructions.
3D modeler, 3D game maker, 3D demo maker
Game engine supporting many 3D/2D formats and graphic effects
Cross-platform real-time strategy game (3D)
Game library for Pascal
A free 3d game for PC that does not limit the player. Fight,Build,Gain