Ask HN: What (non-AppStore) iPad apps are you using?

I was going to say that I was looking for utilities or creative tools like minivmac4ios (https://github.com/zydeco/minivmac4ios) or iSH... But I also know so little about the subject that I'm just curious what you're using, so please post whatever you like!

I have two iPads - an old one I'm turning into a media centre and a newer m4 (my plan for it: https://blog.gingerbeardman.com/2021/03/13/1bit-woodblocks/)