[aroch]

Seafile works pretty well, they install a client a lot like the Dropbox client and sync away. And it is even mostly open source

seafile.com

https://github.com/haiwen/seafile

[jhasse]

Why only "mostly"?

[aroch]

I believe that some of the `pro` or their custom hosted offering's features aren't necessary in the open source code base. But the majority of the functionality is