Weather
OpenWeather: shows weekly overview by default; if you select one day it shows you a nice graph of precipitation and temperature for that day. Good for figuring out the forecast at a glance.
Weawow: the Hourly Details view is amazing for scrolling through the next few days hour by hour and seeing precipitation amount, precipitation probability, temperature, and so on all at the same time. I love the detail it provides. Also, I believe the beautiful pictures in the app are community-donated.
Store apps
Neo Store: Doesn’t allow auto-updating, but I like its layout significantly better than F-Droid.
Social media
Voyager for Lemmy: neat compact layout allowing you to see many more posts at a glance than any other app I’ve tried (Jerboa, Liftoff, Thunder). Also lots of nice features like marking newly created accounts with a baby emoji, ability to share comments as nicely formatted screenshots (I didn’t think I’d use this feature but it’s honestly so convenient!), and ability to customize swipe behavior.
I’m using GymRoutines. It’s for gym routines only, not weight loss or nutrition. It’s perfect for my needs.