Alien Assault: Trade Wars http://aatrade.springfield.net/
Alien Assault Traders is a multiplayer turn based space trading game. Where players use turns that are accumilated over time to trade good and build empires and take over the universe. You are the captain of a space ship, your mission is to go from sector to sector trading different things in order to make a profit. Then when your profit grows, you go upgrade your ship and make it bigger so you can carry more stuff and make more money. You will find different planets as you move around, some are empty, some are owned by other players. You can claim empty planets and move people there and make it big, or you can attack other players' ships or planets if your ship has good weapon and armor.