Open Source MMORPG Framework
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
A simple cross-platform game engine for creating old-school 2D games
CSG for jMonkey
Source code of the chapters of the book 3D Game Development with LWJGL
Reactive extensions for Unity
Asphyre is a cross-platform framework for Delphi and FreePascal.
3D .NET engine for Windows, Linux, Mac
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
Create symmetric sprites: browse, save to PC, or store online
Mahasona engine is an open source game engine.
Multimedia asset management and manipulator for Étoilé
A generic 2D engine for any kind of game
Java Gamepad API for multiple platforms
Modular Gaming Open Source Persistent Browser Based Game Framework
TurboSphere is an easy to learn and powerful JS based game engine.
C++ Framework for slot machine games
Pygrid is an open-source and cross-platform pygame/python 2D engine.
This pack add's custom object and rides into your "RCT3 Platinum" game
Hungry Hero is an open source Flash game built on Starling Framework.
Powerful html5 & javascript library for creating applications & games.