Wulfram II online

Check it out, its an older game (going on 12 years now) but what it lacks in a few graphics it defiantly makes up for in the community and the people that are there who will help you learn.
The learning curve is a bit steep, but once you get the hang of the game its not that hard to go out and start helping your team win.
Its also 100% free!! if you choose to donate you do not get any advantage over any free player accept a little bit more bandwidth is opened to you in the server.

http://www.wulfram.com?mkid=85769 (Wulfram II)