Source SDK is a software development kit compiled by Valve Software that is used to create maps or mods for the Source engine. It contains the very popular Hammer which is used to create maps for Counter-Strike: Source and or any other Source game. This program is the very beginning of the Zombie Escape Mod and maps.
Source SDK has 3 utilities which are the essentials to create maps:
- Valve Hammer Editor – Used to create maps.
- Model Viewer – Used to view models and custom models.
- Face Poser – Used to access facial animations and choreography systems (for characters).
Source SDK has 3 engine versions:
- Source SDK 2007
- Source SDK 2009
- Source SDK MP
All multiplayer versions of Source are now updated to the MP version.