F Droid

een te bekijken selectie
https://thenewleafjournal.com/recommended-f-droid-foss-apps-for-android-based-devices-2021/

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check out as well :

Markor

https://f-droid.org/packages/net.gsantner.markor/
- Create notes and manage your to-do list using simple markup formats
- Work offline
- Compatible with any other plaintext software on any platform – edit with notepad or vim, filter with grep, convert to PDF or create a zip archive
- syntax Highlighting and format related actions
- quick insert pictures and to-do
- Convert, preview, and share documents as HTML and PDF

much more