Browser: Vanadium

Notes, external brain: Joplin

Podcasts: AntennaPod

Radio: Transistor

YouTube: NewPipe

Maps: CoMap

Translation: DeepL

Twitter, Facebook, etc.: Tabs in Vanadium; no app installed

Read stuff aloud: Evie (give it a text file, epub, web site, etc. to listen to it)

Launcher if you like extreme minimalism and don't care about widgets: Olauncher