[0] https://transitapp.com/ [1] https://medium.com/transit-app/how-we-built-the-worlds-prett...
Ole Moritz, the developer is very attentive to detail, dedicated with frequent releases and creative in that the app provides very useful and easy modules to interact with iOs native functionalities.
I also found the community[1] to be lively.
Check out the docs[3], specifically the "Pythonista Modules" section if you want to get an idea of what the app is capable of.
P.s. Also check out his other app, Editorial[2] if you need a plaintext editor on steroids!
0: https://itunes.apple.com/us/app/pythonista-3/id1085978097?mt... 1: https://forum.omz-software.com/ 2: https://itunes.apple.com/us/app/editorial/id673907758?mt=8 3: http://omz-software.com/pythonista/docs/
Also, I don't find their tag system that good for later navigation (this is especially the case on the web version).
And, surprisingly, Google Photos
If you're at all interested in music synthesis this app cannot be beat. It's a lot of fun. I think it's an extremely well-designed app because it really takes advantage of the iPad's multi-touch screen for its virtual keyboard.