There are now a number of standalone planets on the mod portal, but with no straightforward method to search and sort them based on downloads/popularity/etc. Most are under the Content category; some have Planet in the title, some have Moon, some have neither. Tags are a mixed bag as well depending ...

Here is a save where the bug occurs about 20 seconds after loading on the pinned Biochamber. Noticed this about 10 minutes after loading my game on 2.0.30 for the first time. Watch the red inserter putting in nutrients, after about 20 seconds one spoils mid swing and the inserter deadlocks.