Seriously guys, no one saying Nextcloud?

• The main app for photo backup.
• Nextcloud Notes for well, notes you can also use from the desktop.
• NC Passwords for well, passwords
• Phonetrack to record your phone to Nextcloud Maps.
• Deck for the Kanban.

Ente Auth is nice for OTPs, it looks nice and I like that it shows the next code in case it's about to switch.

Neo Store for browsing fdroid

Moshidon for Mastodon

Keyboard:

• AnySoftKeyboard good all around keyboard, good language support, decent though messy customizability
• Unexpected keyboard more specialized, provides easy access to app (printable) ASCII characters and some others, allrght customizability
• 8Vim Cool factor, great customizability, decent language support but you need to learn it

Games:

• Pirate Solitare nothing much but I've been playing it a lot lately
• Simon Tathman's Puzzle Collection a cross platform puzzle collection, has a lot of different puzzles in a uniform style
• Antimine minesweeper with nice ui

System:

• RethinkDNS: DoH provider and firewall Easy to use, especially nice for those non FOSS apps you need to have to maintain a social life, not that powerful though
• Obtainium: FOSS app downloader Downloads apps from releases or equivalent, therefore can have faster updates than fdroid, but no discovery, aside from search on some platforms
• ffupdater: FOSS browser downloader Like obtainium, but for browsers (mostly) and has list of browsers
• Droid-ify: fdroid client better ui than the default app, comes with a list of repos
• Shizuku: ADB shell api not useful if you have root (see SUI, which is the root implementation for the same api, though shizuku will also work I think), but can give a bit more access if you don't supports wireless debugging on A12+
• Neolauncher: launcher nice ui but nothing special
• SD Maid SE: storage cleaner okish ui, doesn't stop me from having 302 (not including system) apps on my device. Yes I have a problem
• Package manager: app manager Shizuku support, powerful, though limited if you don't have root
• Inure: app manager [freemium (8$), but GPL licensed?] pretty must like Package manager but with amazing ui

Media:

• LibreTube: Piped (youtube) client Nice ui, no ads, sponsor block support, kinda unstable
• Innertube: YouTube music client doesn't use piped/invidious, no ads, nice ui
• Tusky: mastodon client nice ui, quite stable, multiuser support
• Jerboa: lemmy client ok ui, up to date with lemmy updates
• Liftoff: lemmy client nicer ui then Jerboa but doesn't work since .15 (?) and had issues with rendering markdown properly
• LibreTorrent bitTorrent client for downloading all those isos and public domain works, nice ui

Misc:

• Mull: ff based browser not much to say, "security oriented and deblobbed", upstreams some features from Tor
• Calculator++: A scientific calculator A lot of functionality while remaining easy to use
• RPNcalc: A Reverse Polish Notation calculator best RPN calculator I've found on fdroid, less powerful than Calculator++, but RPN based calculators are more efficient^[citation needed]^
• Simple Apps: suit of apps providing basic functionality great ui and customizability, I don't use simple keyboard, simple launcher/drawer however
• OpenCamera: a camera app advanced features

Just the apps I thought of, as I, as mentioned in the SD Maid entry, have a lot of apps installed :P

Obtainium is pretty good

Here's a few I enjoy using that I haven't seen mentioned yet:

• Phonograph Plus: elegant music player using Material UI design
• Etar +ICS² : Etar is a nice-looking calendar app that uses Material UI design, and ICS² enables me to sync the Holiday Calendars provided on Thunderbird.net.
• Etar+ DAVx² + NextCloud : enables syncing my local Etar calendar(s) with any NextCloud instance (using CalDAV). DAVx² also allows for syncing my Android contacts to NextCloud (using CardDAV)
• AnySoft Keyboard: extremely customizable, varied keyboard layouts, for those who want all punctuation marks and quote signs built-in.
• Irregular Expressions: alternative keyboard for goofing around with unicode textstyles (🅒🅘🅡🅒🅛🅔🅢, 𝕺𝖑𝖉 𝕰𝖓𝖌𝖑𝖎𝖘𝖍 𝕭𝖔𝖑𝖉, Ｅｘｔｒａ ｗｉｄｅ, etc.)
• Simple Notes : minimalist "note to self" memos.

termux - Terminal and shell, with Linux package environment so you can install and use packages like openssh.

Authenticator Pro. It's like Aegis but supports WearOS devices, so I can get my TOTP codes on my watch instead of having to get my phone out.

FairEmail. One of the best email clients I've used, across any platform. Highly customizable.

Syncthing for syncing photos to my home server.

Readrops for RSS - connects to my FreshRSS server.

Firefox, of course.

Fennec, Bitwarden, Droid-ify, and Tutanota are my essentials I need for life.