• Syncplicity - Syncplicity
  Effortless Backup, Synchronization, and Sharing
  in Software > tools with backup sharing synchronization by 6 users
• SyncToy v2.0
  SyncToy 2.0 for Windows is available as a free download from the Microsoft Download Center. The easy to use, customizable application helps you copy, move, rename, and delete files between folders and computers.
  in Software > tools with microsoft synchronization windows by 3 users

synchronization from all users