Service ship
It have jump drive, tractor beam, fuel transfer system, cargo shuttle, small ammunition storage. Some time some can have hangar and small troop transport bay and some cargo. I use it in early game as rescue, resupply, tanker ship. The cargo is only to go get module found in ruins site. It is bad in all of those job but it allow me to have some capability to do every thing with out building a large fleet, so i have some capability ways faster. I can then take my time to build proper ship for those task with out being worry about a fuel harvester station getting full or a ship getting stuck in a other system after a malfunction.