http://wildfiregames.com/0ad/
Looks interesting.
I don't know why but all these "Life of Brian" quotes popped in my head hah
Looks cool
http://betanews.com/2012/06/14/0-a-d-raises-the-game-for-open-source-rts/
Saw this featured and remembered I should check this game out..
Might be an epic game at frag since it is FREE!