Godot is a powerful cross-platform game engine
Open source HTML5 game framework that offers WebGL and Canvas
Open game and rendering engine packed into a JavaScript framework
Real Time Strategy game engine supporting early Westwood classics
Open Source MMORPG Framework
Gideros Release version
ThinkPHP Framework
Self-hosted CMS platform based on the Laravel PHP Framework
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
Old-school 2D game engine
JavaScript framework to build game engines, games, emulators and apps
A free 3D game engine to create games and realtimes scenes for Windows
Amateur 3D Game Engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
The imaginary eight-bit machine
Free and Open Game Programming Language for Windows and GNU/Linux
Reactive extensions for Unity
An API for interacting with Starcraft: Brood War (1.16.1)
Asphyre is a cross-platform framework for Delphi and FreePascal.