Web IDE in single HTML file
Free 32/64/16-bit multi-platform Pascal and Object Pascal compiler
Cross platform SDK
Cinema Enters Game Console
ZED OS the clone of Windows XP
Cross-platform 2D and 3D game engine
Character animation system for games and simulations.
Reactive extensions for Unity
Cerberus Content Management System
Smart phone automation tool. Support iOS, Android, WebApp and game
A cross-platform interpreter for many point-and-click adventure games
The Atomic Game Engine is a multi-platform 2D and 3D engine
online 4X browser game engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Modern AS3 Game Engine
3D .NET engine for Windows, Linux, Mac
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Egret is a brand new open mobile game and application engine
Science Fiction, heavy assault, disestablishment of power.
Original turn-based strategy wargame & boardgame
2D physics engine for games
Hungry Hero is an open source Flash game built on Starling Framework.