I use Markor on my phone and Notepad++ on my computer.
I also have Obsidian, which isn’t FOSS and is built to save files with every change which I don’t like, but has some nice display features. I mostly use that one for viewing Markdown files, and the other two for writing them.








I looked into it a while back, but it seemed more complicated than I needed it to be, and was oriented around notes being written on certain dates. What I wanted to set up was something more like a simple markdown wiki, with interlinked pages.