While Ubuntu is open sourced, there are quite a few projects under Canonical that are not. Ubuntu One was one of them. Now it is open source. Ubuntu just recently released it’s file synching code for Ubuntu One. Ubuntu One is cloud storage service.
“Today, we’re happy to be open sourcing the biggest piece of our Ubuntu One file syncing service,” Canonical Director of Online Services Martin Albisetti wrote. “The code we’re releasing is the server side of what desktop clients connected to when syncing local or remote changes. This is code where most of the innovation and hard work went throughout the years, where we faced most of the scaling challenges and the basis on which other components were built upon.”
Ubuntu One code is available from Canonical’s LaunchPad.