OS X What are some civilization, shooter and simulation games I can get online for free?

[shtuffle]

I have an iBook G4 running OS X 10.4.11, 1.42 GHz PowerPC G4, 512 MB and would like some suggestions of civilization, shooter and simulation games that are compatible and don't need the internet to play them.
Thanks!

 

[cluthz]

http://guides.macrumors.com/Free_Mac_Games

 

[iKwick7]

Freeciv

http://www.macupdate.com/app/mac/17762/freeciv