Seafile

Client for the Seafile cloud file server and project management software. If you

are in a small team with a few people, you can create a group in Seafile and

invite other team members. Team members can then maintain file libraries

together and collaborate around them.

You can try the demo , sign up for an account at the

website, or since the server-side is also free-as-in-freedom, it can be

installed on any server and configured to work with the app.