I'll check out Vega Strike, thanks. I did actually start writing my own online space trading game. Unfortunately the only "online" language I know is PHP. The engine actually worked very well in single player mode. You could travel to planets within a star system, scan the sector for other star systems and travel to them, or enter hyperspace to travel between sectors. You could land on planets and trade with them, and also refuel and recharge your hyperdrive. You could scan for other vessels (players) and even exchange messages. The problems with this engine started with things which needed to be real-time: i.e. combat. With a scripting language like PHP, it just didn't work properly :-(
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moto