I always want my gallery app to rotate. I never want my email app to rotate. Auto-auto-rotate remembers the last rotation setting for every app I use and will turn it on or off for me. After a day of normal use I literally haven't had to touch the system rotate setting once. It's fully automatic and took zero effort. Having to change the setting manually is more of a hassle than this.
Sleep for Android, great alarm app with many functions.
I have mine set to vibrate my watch for 5 min, if I don't wake my phone will slowly ram up the ring volume. I get two snoozes and then it won't snooze again until I scan a QR code in the bathroom.
Best alarm app ever. It can do a ton.
Google rewards, gives you short surveys for money you can use on the play store. I bought sleep for Android pro a long time ago with the rewards. I have made about 100 dollars. Surveys are easy and fast.
OmWeather from f-droid is ok. Also I just installed Fossify Gallery (photo viewer) and like it so far. I don't know what counts as a QoL app though. Does something like Jami count? It's a more private alternative to Skype and phone calls. I haven't yet tried to use it though.
Quick Cursor. Not FOSS, but it is a huge quality of life improvement now that phones screens are getting bigger over time. It displays a virtual joystick which functions similar to a mouse to reach all areas of the screen during one-handed use. This is basically essential for phones with huge screens.
Open up the manager. Go to patcher. Select the apk from storage, select the patches you wanna apply. Click done. It'll then start applying the patches which'll take some time, but after that you'll be able to install the patched version.
i heard it was gonna be discontinued (im not sure, cause i can still use it perfectly), but stealth does the same thing and works+looks better than geddit from my experience.
edit: nevermind, i just checked and have got no clue why i thought it was being discontinued.
Reddit started charging per API access, making all the third-party apps infeasible. I know RedReader managed to get an exemption for being particularly useful with screen readers for the vision-impaired. Reddit's API changes still apply; NSFW subs now can't be accessed without logging in, although NSFW posts in SFW subs show fine without log-in.