The home site of the creator of VGA Planets, Tim Wasseman.
The NAVGAP site. It is the largest robotic service Tim has seen, with 91 current games.
Spaceport Hamburg, a constant tournament site. It is rather graphic intensive, but a nice site.
Confed Headquarters. It is also a graphical site with only a few games, but has most of the strategy guides for the races, so it is a very good site for beginners.