[highball-it]

I'm using ownCloud[0] in version 7 and 8. In the early version ownCloud was a bit hard to configure and run on your own. But the new versions are really good (in my opinion). For me it's very reliable.

[0] https://owncloud.org/

[microtonal]

I once wrote a plugin for OwnCloud for work. But before running OwnCloud on a server I would first like to see an audit and/or analysis of the code. I read some code of IIRC version 5 or 6, which made me skeptical.

Maybe it's better now.