Seafile is an open source file syncing and collaboration platform for teams. It comes with Dropbox-like file syncing, but is designed to be better suited to teamwork. You can build a file sharing and syncing service for your team on your servers.
If you need a new feature or find a bug, you can summit your request to our github page at https://github.com/haiwen/seadroid. We will actively maintain and update android client.