If you're a complete space nerd like me, you might want to know that BossConstructor is now a damn fine game and it's still being updated with new stuff.
OpenRA is a fantastic game engine, which enables you to play Command & Conquer, Command & Conquer: Red Alert and Dune 2000 on Linux. The latest test release is rather nice too.
If you're tired, ill or just downright lazy, you might want to take a look at the recently released Lazy Galaxy. The game is currently in Early Access, but even so it's showing a lot of promise.
For those who missed it, my original post about the time-travelling tactics game All Walls Must Fall had me really impressed, I'm even more impressed with the latest updates.
You might not remember, but TINY METAL is a strategy game inspired by games like Advance Wars and the developer told us it would come to Linux. It's now out for Windows & Mac, but Linux is still firmly planned.
0 A.D. is a pretty game, probably one of the nicest looking open source games around and this latest development update gives us an idea of what they've been doing.