I'm personnaly a fan of the Quake3 MOD
Urban Terror. It always annoyed me that I couldn't doubleclick right into a UrT game, but always had to lauch Q3A and then switch to the MOD.
Recently Urban Terror created a online
server browser. This uses q3ut:// links to launch your games right from the browser. Unfortunately there was no Mac support.
Since I knew how to implement all this, I finally decided it was time. I created a launcher application for Urban Terror (only 8 hours of straight coding combined with some additional online activities

Since I don't feel like supporting and keep developing this (too busy with VLC), i decided to open source it, so the community can do the rest themselves. I've shown you the way, did the hard stuff, do with it what you want.
So you can find it here:
http://forums.urbanterror.net/?actio...&pageNum=1
I trust the source will be available soon as well. HornetOSX is working on giving it all a real place within urbanterror.net