ownCloud Client

https://owncloud.org/install/#install-clients

ownCloud is a software system for what is commonly termed "file hosting". As such, ownCloud is functionally very similar to the widely used Dropbox, with the primary functional difference being that ownCloud is free and open-source, and thereby allowing anyone to install and operate it without charge on a private server, with no limits on storage space (except for disk capacity or account quota) or the number of connected clients.