Ze Text Adventure game Builder : Create as you play !
BxEngine For Marmalade And QT
2D game engine for traditional platform games
Reference implementation for the Doom game engine.
Godot is a fully featured, open source, MIT licensed, game engine.
IGS Labs
A conservative source port of Heretic that is identical to DOS
Java Game Engine
mGSTEP port of the Cube game engine
Open source reimplementation of GTA San Andreas game engine in Unity
Smokin' Guns - unofficial release for Mac OS 10.5
online 4X browser game engine
A complete 2D Game Engine with built in drag and drop editor
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3
Simple and low-consumption Java 2D Game Engine
Amateur 3D Game Engine
The second demo of my game engine.
Java Game Engine Project