This is probably the best list out there...specific recommendations in a category usually requires some googling, though.https://www.home-assistant.io/integrations/
There's a lot of momentum to move away from reddit right now, and closing registrations would be a wet blanket. Personally, I'll take the performance issues and transparency in the process over closing registrations.
Molly is in f-droid, though it's technically third party. Looks identical though.