just scrolling trough my phone, here's some I like

app opps - lets you change permissions for apps, handy if you want to have multiple things playing audio or use google photos without it scanning your phone.

calcu - it's a calculator!

simple draw - exactly what it says on the tin

es file explorer pro - versatile, but not bloated

moon+ reader pro - a handy reader for all sorts of docs, including search etc

polarr - a photo editing app with features not a lot of apps have. The devs are pushing some dumb filters tho

handy photo - same as polarr

mx player pro - got videos to play?

poweramp - a music player

poweramp equalizer - is what it says on the tin

sd maid pro - for clearing out old files and such

poweraudio plus - used to be the only app with a parametric equalizer. Now poweramp does too

ultrachron - just a nice timer/stopwatch

unified remote - a remote control app, be careful tho, I doubt this thing is secure

web video caster - also downloads videos from plenty of places

and a couple more apps, where the developer has decided to pull the lifetime license and move to a subscription, even after I had bought it

officesuite pro - it's handy, but f them