- There is the CoTI supplement which I think is what makes up Supplement MK-002: Starports by http://micki001.cnc.net which seems to have been absorbed into a StarTraveller Supplement STP-002 (legitimately or not).
- The Compleat Starport (article in Far & Away issue 1 by Pacific Rim Publishing, J. Andrew Keith)
- The Compleat Starport/Starport Landfall double booklet (Star Quest Games)
- Various SPA chunks in JTAS
- Judges Guild 50 Starbases (I didn't love the graphics, admittedly a fair effort given the time... but the text had some interest)
- Gurps:Starports
- Quite likely something in MT's Starship Operator's Manual
I think that's most of what I know about these products, but there could well be useful reference in T20, MgT1 or MgT2 that are unknown to me.
There might be something somewhere in TNE or Hard Times stuff too.
Probably some other 'fanzines/magazines' that have info.