A viable FOSS set for any degoogled Android:

- Launcher: KISS Launcher

- App sources: F-Droid + FFUpdater + Obtainium

- File manager: Amaze

- Keyboard: Thumb-Key (unless you have a physical one)

- Browsers: Mull/Mulch, Firefox Focus, Tor Browser (all via FFUpdater), Pocket Gopher, Buran

- Email client: K-9 Mail

- Camera: Open Camera

- OTP app: Aegis

- CLI environment: Termux

- Media players: VLC, Xmp Mod Player, Clipious

- Communications: Conversations, aTox, Element, Linphone, Jitsi Meet

- Crypto wallets: Unstoppable, Monerujo, Ywallet

- Smartwatch interaction: Gadgetbridge, Casio G-Shock Smart Sync

- Utils: Orbot, Orientation Faker, Wasted