Neo Steam, a free mmo that I'm currently testing. right now it's doing early access beta testing and hasn't opened up to open beta. There are a few things that are still buggy but over all its decent. The theme of the game is futuristic but everything works on a substance called neo steam. On some weapons and armor you find that has a socket you can put a new steam core in it. With that the item gains it's own ability you can use with a steam tank that you equip. The game is being produced by Atlus. Some of you should know this particular company for it's persona games and Odin sphere. to name a couple off the top my head. well here's a link to the Neo Steam site.
http://neosteam.atlusonline.com/ By the way this site might not be good to look at with a dial up connection.