There's a new release of SoulFu. Whilst the source still comes under a funny license that many would not consider true open source, I believe any restrictions previously placed in the game are now removed. Downloads are up for Linux, Mac OS X, and Windows.
If you like the game concept but feel strongly about the source code license then the main alternative has to be Egoboo Resurrection - ironically also originally developed by Aaron and no surprise given the graphical similarities. [Edit - a better link, thanks Jacky. Also worth noting is that Egoboo Resurrection is currently available only for Windows although it should be compilable for Linux.]
Also the FreeOrion team snuck out another release - 0.3.1-rc6 - a couple of weeks ago. It's an explore, expand, exterminate [is that correct] kind of space strategy game with a very nice user interface and designed for a deep gameplay experience. I don't recall seeing this release announced anywhere. Also, it seems a strangely large update from 0.3.1rc5:
This release has many UI improvements, new art, bug fixes, and various minor and medium-scale backend changes. Notable major changes are the long-awaited OpenAL sound system (removing a non-free dependency) and Python AI scripting that can be modified without needing to rebuild FreeOrion itself.
Meh, who am I to argue but really, that's surely worthy of a 0.3.2 label at least!? Anyway, the game is available as a Windows installer but Linux users must compile from source.
Finally a quick note on the Open Football project. On the wiki is a small update saying that the game should be at a playable demo state before Christmas this year. Great news for a fantastic looking project. :-)