- Florisboard - FOSS keyboard with support for glide typing
- KISS Launcher - Lightweight, search based, customizable launcher. Also
- MuPDF - PDF viewer
- Logseq - Notes. TODO list. Ideas
- Syncthing - For syncing across devices
- Newpipe - Youtube clilent
- K-9 mail - For email
- Feeder - RSS feeds
- Tusky - Fediverse
- Mull browser
- Brave browser
- Organic Maps - For maps and navigation.
- GMaps WV - For maps and navigation.
- Auxio - music player
- Bitwarden
- Termux
- Mega-android - Cloud storage
And ofcourse, F-Droid with additional repos (IzzyOnDroid, Newpipe etc.)
Apart from Logseq's whiteboard feature, do consider checking out logseq's actual workflow (adding stuff in journal etc.). It does have a learning curve, but you might end up liking it more than Onenote's.