This app allows you to create your own Galaxy sectors, given some simple input values. You can then use the maps in roleplaying games such as Traveller, GURPS and Mothership.
The Sector view shows each solar system and the jump routes between them. You can then drill into each solar system and view all the orbits and orbital bodies and see all the data about their atmosphere, biosphere, tech level, law, government, bases, satellites etc.
This app generates random star maps using the “RTT Complicated Star System Generator” detailed on the RPGnet wiki (https://wiki.rpg.net/index.php/RTT_Worldgen) under the Attribution-ShareAlike license.