A space-based MMO that is totally free. They do accept donations for server fees, however. Go to <a href="http://www.net-7.org" rel="nofollow">www.net-7.org</a> and see how you get the software and set up an account. The admins keep things interesting, as there was a ton of code that was never implemented. They get to play with that and keep it going. If you start playing, let me know and I'll help you get started.