Google Mobile - Sync
http://www.google.com/mobile/default/sync.html

save

Synchronize the contacts and calendar on your phone with your Google account

Synchronize the contacts and calendar on your phone with your Google account. Cloud syncing

Nokia S60

synchronize your contacts between Microsoft Outlook and Google Mail

Synchroniser sa librairie iTunes sur le web. Makes it easy to keep iTunes music libraries in sync, securely backed up and streamable from anywhere

"Drag and drop iTunes sync! Just drop your tracks into the Echodio playlist to synchronize tracks, tags and ratings across all your iTunes libraries."

PureSync Professional - Supports FTP - Execute backups and synchronization as different user - Copying of opened/locked files - For business use

opensource file sharing application, works without copying files to a central server, is cross platform and handle any file type

Collaboration software built on top of XMPP.

The Collaborative File Sharing Client JakeApp Keeping your files in sync - even with large groups - has never been easier.

gContactSync is an extension that synchronizes contacts from a Google (Gmail) account with an Address Book in Thunderbird 2 or 3 written for my Google Summer of Code project in 2008. Version 0.1 is out, and please report any errors you find, or suggest enhancements. See the installation page for more details.