SimCity, open source. The news is nearly a year old, but now it has been released and you can try to compile it. Download the source or get it via git: git clone git://dev.laptop.org/
projects/micropolis-activity. Unfortunately neither version wanted to be built on my machine. =(
The name SimCity was removed from the game, along with the plane crash disaster. The new name is Micropolis. According to a text file in the release, child-friendly graphics are wanted for the OLPC version.
Update: Micropolis has now it's own home page.
In other news, Spring 0.76b1 has been released. The Changelog reveals that for example installing mods is now easier. Hopefully it'll work for me, until this day I was only able to run the engine tech demos. Let's go get it then!