The ownCloud sync client - github.com/owncloud/client

ownCloud client enables you to connect to your private
ownCloud Server. With it you can create folders in your home
directory, and keep the contents of those folders synced with your
ownCloud server. Simply copy a file into the directory and the
ownCloud Client does the rest.

ownCloud gives you anytime and anywhere access to the files you
need, whether through this desktop application, our mobile apps,
the web interface, or other WebDAV clients. With it, you can
easily view and share documents and information in a secure,
flexible and controlled architecture. You can extend ownCloud
with plug-ins from the community, or that you build yourself.