Derelict or Abandoned Freighters that you can repair just like a ship on a planet. The freighters would just be drifting in space though.
While on the subject of derelicts, picture this…
You warp into a new system and find the location of the nearest space-station following the obligatory scan. You head for it and fly past a destroyed freighter, eventually you land in the station to find it over-run by a hostile unknown alien species.
After an intense fire-fight you manage to clear out the inhabitants and behind a barricaded door you find a Gek who has been hiding out since the alien invaders took over. You discover that he was the administrator of the station and as a reward offers you partial-control of the station.
After doing some side-quests to get the Station back to an operational standard you now have access to a generous storage vault, a terminal which lists all planets in the system as well as ships currently docked in the hanger.
These ships are other players who are passing through, you notice quite a few players are doing this so you raise the slider on the ‘Docking Charge’ to 1000u, may as well make a bit for use of your facilities.
You decide to upgrade the station further, unlocking different blueprints for ship upgrades, players are now landing and paying you to upgrade their ships cannons, drives and shields, saving them the bother of learning the blueprint and finding the components.
As these players are passing through they are stopping at the planets too, their data is also uploaded to your station, giving you and anyone that wants to view it, lots of information about the current system as well as another way of earning units.