Voyage Century Online.
 

This is a Free to Play Online MMORPG. Rather fun, and addicting. It is a large download though 1.18GB, but I think it's worth it. The required system specs are very small. You can wage battle out on the sea, it has fishing, mining, blacksmithing, sewing, and weapons training. Basically a Pirate game, but I'll let you see it in action with a youtube video. I would Highly reccomend this game to anyone who likes MMORPGS.

http://youtube.com/watch?v=rTzi27el0mQ


Actual Site : http://www.voyagecenturyonline.com/