I use Jotterpad on Android to edit markdown and text files. It syncs well with Dropbox (it feels just like a frontend for a dropbox folder) and supports .txt, .

I use Jotterpad on Android to edit markdown and text files. It syncs well with Dropbox (it feels just like a frontend for a dropbox folder) and supports .txt, .md, .markdown, and .fountain files. I use Brackets and Typora to edit .md files on pc/mac/linux. I find image handling in .md files fairly simple as long as you maintain an appropriate folder structure on the backend. Typora makes this especially easy. I would like to build a better self-hosted tagging/viewing program for my huge cache of notes - something like Google Keep without being, well, Google. Turtl comes closest to my needs, but the lack of import/export at this point is a problem. I do not wish to be tied to a particular format or storage space.