Nice! Maby a small video preview or gif would help new users to understand what each plugin actually does? Links to the plugin sites would be great too, as they usually have documentation on them.

I've been in a similar situation as the OP. I was trying to share an external USB drive with Linux, OS X and Windows 8 with my git-annex archive on it. Turns out exFAT doesn't support soft links (git-annex needs them to work), which is a feature I think should be supported by any modern filesystem. In general, you're shit out of luck with git-annex os interoperability :/.