The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven, shader-based renderer, accurate lip sync and facial expression technology, and a powerful, efficient and completely network-enabled physics system.
No More Room in Hell 2007 Christmas media release and updates!
Source mods can now run from the Orange Box engine code without requiring an Orange Box game.
Access Orange Box game code and other beta updates with "-beta srcsdk0122".
Synergy version 1.1 will be available on Friday (January 11th, 08).
Synergy version 1.1 released today. This version enables you to play Half-Life 2: Episode One!