SparkleShare - Sharing work made easy
sparkleshare.org
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
SparkleShare is a syncing and collaboration tool that shines by its absence. It's designed to get out of your way, to make sharing documents and collaboration easier, and to make peers aware of what you are doing.