Foundry VTT, Dungeondraft, whatabou dungeon generator, Mork Borg DUNGEN and monster generators, Procreate for drawing dungeons, Stable Diffusion for images I can’t find, various character generators/builders for whichever game I am running.

I spent too much time looking at the shelves before I found it

I recently picked up Scum and Villany which is made to do exactly what you describe. I havent had a chance to run it yet though so the advertised use and actual game feel may be a bit different.

There is also Vast Grimm, a scifi reskin of Mork Borg. It is more locked into its setting than Mork Borg but with the expansion books that just came out it has plenty of options for space combat added in.