Developers of such projects as Source modification Shotgun Sunrise and UDK games Vroom and InFlux.
InFlux 
InFlux is a puzzle game that mixes exploration and puzzle platforming in a series of beautiful natural and abstract environments. You are a mysterious...
Vroom! Vroom is a racing and vehicular-zombie-flattening game for iThings, Windows and (any day now) Mac, based on Shotgun Sunrise and made with the UDK. Drive...
The world’s first cooperative multiplayer vehicular objective-based zombie Western.
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We are working on a mod called "Dead West", it looks a little like SS.
I wonder if someone of this development group could help us with it,
we are in desperate need of a coder.
BigBigBigDaddy,
Dead West Dev. Team
looking for a member?
Depends on your skills, yo'.
If i knew how to make mods id join yall But sadly i dont
Keep up the good work!
Superb mod guys!