I'm curious if anyone's come across a list of "power" or "professional" apps for Android. I mean things like Termux, Audio Evolution, or PowerDirector, which provide functionality that you would normally need a computer for. I'm being purposefully broad so that I can discover more cool apps, but generally I mean things aimed more for power users (like PowerDirector vs Premiere Rush).
Not sure if this fits your category but here are a few FOSS apps I have:
SuperImage for upscaling locally using your phone's GPU;
Image Toolbox to convert, crop, resize, do background removal (by hand though, so nothing fancy like Magic Eraser), apply a bunch of filters, draw on a sketchbook, encrypt any(!) file, edit/remove EXIF data, pick colors, compare two images with a slider, generate a palette from an image;
Squawker to follow (without an account) multiple Twitter/X accounts as if they were RSS feeds with the ability to group them (cool when you're trading and need a bunch of news sources grouped by sector, but it depends on Elon not messing around with the Twitter layout again as otherwise Squawker will also need to be updated);
Hey, Image Toolbox seems quite useful. I was initially scared when I didn't see much other than the previews on the play store page, but after finding it's GitHub repo I calmed down. Hopefully I don't forget it's installed since some of these features seem great!