This project is developing a tool to to convert Confluence pages into Markdown.
I have a lot of Confluence content which I'd like to move to GitHub wiki. I failed to find an adequate tool to do this so I'll have to implement one.
The easiest way to do it seems to be to export pages in the Confluence Storage Format (which is XHTML based, i.e. valid XML) and to transform them into Markdown using XSLT. There's a similar tool available, but unfortunately its output is not exactly suitable for GitHub Wikis.