The early bird has to wait for the worm. And when he wanders off a bit bored, he gets back to find some other bird has poached the worm and his morning was fruitless. So, there you have it, you may as well lie in.
There's an update to Battle for Antargis, version 0.2.1.5 which is labelled a "developer release". The build system has been overhauled so the game should be easier to build. There have been improvements to the game too and the next version should be the first Antargis release to feature a storyline. I really like this project, Godrin is creating an entirely original game that doesn't conform to any particular standard mold.
Bos Wars pre2.5 is available for download. Improved graphics with beautiful particle explosions, new maps, and bug fixes. Sounds like this project is galvanising now that the developers don't have to focus on separate Stratagus releases.
Nimuh 1.0, "searching for the andalusian treasure". Interesting looking isometric puzzle game. I don't think the game data is open source but it looks like the engine is and the game is still free to download as a whole so, well, it depends on how ideological you are.
I came across an interesting site that seems to be collecting [links to] downloads for open source Linux games. It seems to be mostly Suse entries, probably saying more about the people responsible for the site than the fact that Suse is the most popular distro. Ubuntuers can always go to GetDeb for a few game options.