Overgod, an abstract shooter using Allegro, is a fast paced top down shooter. It's fun although pretty tough, and has a nice retro feel but with good modern graphics. It's one of those games you can pick up and play for 5 or 10 minutes, let off some steam, then be back to whatever it was you were doing without having lost too much time. It's available for Linux, Windows, and Macs. :-)
Cube Legends (formely known as LOZ:Cube) is a Cube mod, inspired by the Legend of Zela series of games. Since Cube is getting a bit old in the tooth and has been superceeded by Sauerbraten, somebody has stepped up to work on Cube Legends 2007 which will bring this popular Cube mod up-to-date to run on Sauerbraten.
FreeTrain has gained another developer, and progress on fixing up the codebase continues. Even better, there is an additional plugin set which contains something like 200+ plugins for FreeTrain, and in the coming weeks it is being translated as well. There's stuff like a rollercoaster plugin in there, so it should be really cool. Internationalization is the next task to be tackled, then after that it will be replacing DirectX with SDL so that the game can be ported to Linux and other platforms. :-)
Last one for today, StarShip Troopers: Last Defense development is going well. They posted a gameplay video which looks promising, and expect to have a playable release in the next week or so. However despite the obvious progress being made with the game, there is obviously a fair amount of work to do before it captures the veracity of the battles in the movie, so don't be too expectant. I hope they offer a Linux version of this Glest conversion but could find no information one way or the other.