Panumbra is a graphical, multiplayer online RPG that uses Java. It is currently in demo version but it is the biggest part of their website. However, this page is concentrating on web wargames. Space Merchant is a space trading game, similar to Tradewars. It is cartesian based with connected sectors - so it is not borderless.
Most sectors have a port and different resources they buy, and others they sell.
There are 7 different races, of which you belong to one. Politics is more interesting in that players can put bounties up on other players at government HQs. I did not find it terribly fun. The trading element was very repetitive and dull, and it would clearly take a while to get to a point where you can really do something else. That was in a beta testing stage a while ago, however.