Ice Raven - Firefox derivative that has Ublock Origin and other useful extensions such as bypass paywalls.
Boost for Reddit - Shutting down soon.
Gmail - Simple and works for me.
Geometric Weather - I check the weather daily, so this app is useful to me.
xManager (Spotify) - Mod to get rid of Spotify ads.
Neko - Tachiyomi fork for my manga
Tachiyomi J2K - Tachiyomi fork for my NSFW doujins
Discord - I use it for my anime, gaming, etc. communities.
Modded GCam - I use a custom rom on my phone, so I also have a modded gcam which significantly improves over the default camera app of my phone.
Apps that I don’t use daily, but I still find useful.
Obtanium - I really only check this app when it notifies me of a new update. Still useful since I don’t have to go to GitHub for each individual app I want to update.
F-Droid - Has open source apps.
Notion - Useful note-taking app. I use it once a while for school notes that I want to do digitally (I prefer doing notes by hand).
Poweramp - Offline music player. I use this when I am going on long road trips and need to put on airplane mode to save battery.
Apps that I don’t use daily, but I still find useful.