Xash3D FWGS engine
Multi Theft Auto is a game engine
The HTML5 Creation Engine
Open source library for creative expression on the web, desktop, etc.
Vivid3D is a C++ IDE/3D engine, with python scripting.
Mini game engine for games104
Low-Level Game Engine for Retro Platforms
OpenSAGE is a free, open source re-implementation of SAGE
A game engine written in the D programming language
A C++ 3D game engine.
3D Game engine
TurboSphere is an easy to learn and powerful JS based game engine.
3D game engine for C and C++
Demonstrating the features of jMonkeyEngine 3.
Zen3D is a 3D engine and editor for creating games