Engines & Libraries

Open Source Game Engines

OGRE3D LGPL 3D engine

• Ogre WiKi - Official Ogre 3D Wiki
• Yake - Game engine based on OGRE3D
• OGE - Open Game Engine (based on OGRE3D)

Crystal Space LGPL 3D engine

• CEL - Crystal Entity Layer
• CELstart - Scripted game executable
• Crystal Core - Official Crystal Space demo
• Crystal Community - Crystal Space community page

Irrlicht ZLIB 3D engine

• IrrLicht Wiki - Official Irrlicht Wiki
• irrKlang - Sound engine for Irrlicht
• irrEdit - World editor for Irrlicht

GPL Quake engines

• Dark Places - A highly updated Quake based engine
• QuakeForge - One of the eariest GPL Quake projects
• GLQuake and GLHexen2 for MacOS
• Open Quartz utilities - for map compiling, making pak files, etc.

GPL Quake2 engines

• QFusion - A highly updated Quake2 based engine
• EGL - Another highly updated Quake2 engine

GPL Quake3 engines

• IOQuake3 - The standard improved GPL Quake3 engine!
• XReal - A highly updated Quake3 based engine
• Evolution Q3 - Another highly updated Quake3 engine

Aardappel's Engines

• Cube - 2.5D engine & editor
• Sauerbraten - ZLIB licensed 3D engine & editor
• Quadropolis - Cube & Sauerbraten resources

Various 3D Engines

• Sylphis3D - fully featured GPL 3d game engine
• Spring - Total Annihilation like RTS engine & game
• Glest - GPL RTS engine & game
• Freespace2 - Improved Freespace2 engine !unfree!
• Thunder&Lightning - GPL flight simulator engine & game

Various 2D Engines

• FIFE - Flexible isometric fallout like engine
• Stratagus - Real time strategy engine

Open Source Game Libraries

Open Source Physics Libraries

• Bullet - ZLIB 3D Collision Detection and Rigid Body Dynamics Library
• ODE - BSD rigid body dynamics engine
• Flatland - BSD 2D physics engine

Open Source Network Libraries

• OpenTNL - GPLed Network engine from the Torque engine
• RakNet - GPL high performance network engine
• HawkNL - LGPL low level network engine
• RaptorNL - Successor to the HawkNL networking library

Procedural content creation

• FxGen - Procedural texture generation tool & library
• ngPlant - Procedural plant generation tool & library
• OpenTree - Procedural plant generation library
• Munty engine - GPL neural networks procedural animation library

Various Open Source Libraries

• Cal3D - LGPL 3d character animation library
• COLLADA - 3D Model exchange format
• Audiere - LGPL high-level audio API
• HawkVoice - LGPL multiplayer voice over network API
• FEAR - GPL artificial intelligence for games
• OpenSteer - MIT Steering Behaviors for Autonomous Characters