We are moving from docx to markdown files for many internal documents but want to keep everything one place in owncloud.
There seems to be many attractive markdown/wiki/kb front end combinations out there. Having one of them support owncloud/webdav as a backend or integrate as a plugin, maybe by putting index.md files in directories could be great.
Markdown owncloud app is nice and we use it. But a tighter integration could ve very powerful. Jingo and hazel, seem pretty popular. Hackpad seems very powerful. I am sure there are many others.