Desktop/Android/HTML5/iOS Java game development framework
Cross-Platform C++ 2D/3D game engine
Gideros Release version
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
3D Procedural Game Engine Using OpenGL
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Parabator 2 - Free 3d board game
A modern, cross-platform Quake game engine based on FitzQuake.
A cross-platform port of Hexen II game.
3D Engine c++
GemRB is a portable open-source implementation of the Infinity Engine
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
Hardcore 3D space shooter with spaceship upgrade possibilities.
A free 3D game engine to create games and realtimes scenes for Windows
WW2 U-boat simulation
LDraw™ editor for LEGO® style digital building instructions.