Seafile is a next-generation open source cloud storage system with
advanced support for file syncing, privacy protection and teamwork.

Collections of files are called libraries, and each library can be
synced separately. A library can be encrypted with a user chosen
password. This password is not stored on the server, so even the
server admin cannot view a file's contents.

Seafile allows users to create groups with file syncing, wiki, and
discussion to enable easy collaboration around documents within a
team.

Note:
This package conflicts with seafile-server. Install just one of
them at the same time.