Vlambeer's FPS game for Windows and OS X that was originally available only on Venus Patrol is now free for their 3rd birthday celebration:
http://vlambeer.com/3/
There's also a prototype of their upcoming game Wasteland Kinds, an art book, and codes for the Vlambeer OST and Luftrauser pre-order on Steam (I think those are gone now, though).
Sorry if this was already posted.