TuxPuck is an OS X port of the Linux game. It's a kind of air hockey simulator, along the lines of the awesome Shufflepuck Cafe, it's also fiendishly hard.
It is released under the GPL, you can read more about the original game and get the source code on the TuxPuck homepage.
This release is currently only compiled for the PowerPC architecture, however it will run fine and has been tested on an Intel Mac.
It is bundled as an OS X installer package as there are some dependencies on some other frameworks which it needs to install. These are SDL, Ogg Vorbis, libjpeg and libpng. Unfortunately, at the moment these are not bundled as a part of the App and SDL, Ogg and Vorbis are installed in /Library/Frameworks and the libjpeg and libpng are installed in /usr/local. Typically this won't cause a problem, but don't say we didn't warn you :)