I just looked at GitJournal now, first time hearing of it. Would it be able to support other note-taking formats, such as org-mode, or is it tied to Markdown?
It currently supports Markdown, Txt Files, and OrgMode. The OrgMode is thanks to an app called Orgzly [0] whose Widgets are being used within GitJournal. Also, I'm additionally working on letting you open any text file [1], but I won't make a release of this until early next week.
I'm literally working right now on removing more of the code which assumed all notes would be in Markdown format, and make GitJournal open to supporting any.
If you try it out, please let me know how it did for your use case. I'm just getting started with OrgMode.
Out of curiosity, if you had to pick your biggest annoyance with GitJournal, what would it be?
Disclaimer: I'm the author, looking to improve GitJournal.