SparkleShare is an Open Source collaboration and sharing tool that is designed to keep things simple and to stay out of your way. It's available for Linux distributions, Mac, and Windows.
How does it work?
SparkleShare creates a special folder on your computer. You can add remotely hosted folders (or "projects") to this folder. These projects will be automatically kept in sync with both the host and all of your peers when someone adds, removes or edits a file.
Setting up a host
SparkleShare uses the version control system Git under the hood, so setting up a host yourself is relatively easy. Using your own host gives you more privacy and control, as well as lots of cheap storage space and higher transfer speeds. We've made a simple script that does the hard work for you. If you need to manage a lot of projects and/or users it may be worth setting up a GitLab instance.
Free and Open Source
SparkleShare is Free and Open Source software and licensed under the GNU General Public License version 3 or later. You are welcome to change and redistribute it under certain conditions. Its library
SparkleLib is licensed under the GNU Lesser General Public License version 3 or later.
Compiling from source
Have fun, make awesome. :)