Check out this game called wesnoth:its a mix between warcraft and civ
It is a tbs ,low graphic but amazing game play and there is an alive community
The pros and contras:
+ Its free and not put up by any compagny,even more you can start creating scenarios yourself
+It works on all systems(even macs ;-) )
+It is incredibly epic
+a great multiplayer community
+you can go singleplayers and play scenarios in campaigns (don't underestimate them in total you spend 200 hours over it)
+the games keeps improving in time

- you are addicted to WOW and you think you need cafiene now


So go to this site,check the forums or press on the download button!
And if you want to make an appointment when you want a duel or a 2Vs 2
you just PM me

www.wesnoth.org

You should have made some reseach there's already a thread for Battle for Wesnoth. :)
It's an excelent game, even if you play custom games and not the campaigns.

- Reno, part of the Finnish Translation Team.

Ah, yes... I originally found it on FreeBSD... possibly the only good-quality game that runs on FreeBSD...