Running the open source edition of PowerFolder
PowerFolder client is available as open source at GitHub and sourceforge.net. It can be run with the free edition of PowerFolder Server to setup your own private cloud for syncing and sharing files. The open source components of PowerFolder are released under GPL.
The following guide will explain how to setup the Open Source Client of PowerFolder and how to connect to a PowerFolder Server:
https://wiki.powerfolder.com/display/PFC/Running+the+Open+Source+edition