Turbulenz is a modular 3D and 2D game framework
Unity3D DIS(1278.1) Implementation
A 3D game engine in java.
A Flash Molehill (Stage3D) GPU accelerated 2D game engine
2d/3d Game Engine
a very lightweight advanced terrain-rendering and 3D map rendering sys
plugin-based RPG manager in C++ and Qt5
3D Game Engine
A free and open 3d action game.
An advanced flexible game engine for Java.
Paintown is a 2d fighting game engine.
Godot is a fully featured, open source, MIT licensed, game engine.
An online multiplayer turn based strategy game and board game engine.
Brand New "hidden in shadows" game for LÖVE.
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
A space game in the Hoshikaze 2250 universe, built on the NAEV engine
Mahasona engine is an open source game engine.
A Lua Game Engine
THIS SOFTWARE IS IN PRE-PRE-PRE-PRE-ALPHA. So don't really download it