Have anyone ever heard about Theme Park Builder 3D? it seems to be open source, but I can't figure out much information... Also, it seems to be entirely x86, so would be a "no go" too... but we can hope!

Edit :
Also would be nice to have : ( open source )

- Allegiance
- Armagetron ( GLtron look a like, I have seen this somewhere else in here too, but has better graphics )
- Darwinbots ( I know, geeky, but isn`t it a nice addition? )
- FlightGear ( Mostly written in C++ programing, also avaible in Linux plataforms )
- Oolite
- SuperTuxKart ( Nice graphics =)

I know, it`s too much to ask for, but they are only ideas !