There's a preview version of Bos Wars 2.4, an RTS in the style of Red Alert, available for download for Linux and Windows (and should compile on other OSes). This version introduces...
"a completely new rate-based economy. Energy is produced by power plants and magma by magma pumps. Building also consume resources continously instead of requiring an upfront payment.
It sounds interesting. Bos Wars development is very active although the majority of developer communication happens on irc instead of the mailing list, which can make it look - to the casual onlooker - as if not much is happening. They could probably do with a devblog too!
FreedroidRPG 0.10.2 final got released as well - well, renamed from 0.10.2rc4, whichever way you prefer to call it. One thing I didn't mention yesterday was that I really like FreedroidRPG's graphics. They are very distinctive and quite good. :-)
The SuperTuxKart 0.3.0 release is tantalisingly imminent. Announcement will be any day now, perhaps over the weekend? A lovely new island track and Hexley the platypus character are two highlights of a significant improvement over the previous version. This game has a lot of potential, so hopefully this release will get a few more people interested in helping out with the development.
Speaking of project communities, Glest, the rather well done 3D fantasy RTS, has quite an active one despite the seeming inactivity of the main developers. This guy has released a final version of his Indian faction for the game. The faction has involved, including learning, some 500 hours of work so is worth checking out. Another guy has a blog dedicated to Glest and there's more WIP factions happening in the Glest forums. Admittedly some of these fan efforts are more enthusiastic than they are well executed, but everybody starts somewhere so good luck to them. ;-)
On a side note, if you are a Linux user with an ATI graphics card and have problems running Glest, this tip might help out.