BitTorrent - (Free)
BitTorrent Sync is a simple and flexible application for synchronizing and sharing files between different computers.
BitTorrent Sync is a popular and flexible application that offers an open source alternative to online storage services like Google Drive, Dropbox or SkyDrive users, allowing you to sync and share files between different computers. Thanks to the use of P2P technology, you can share files at maximum speed without any limits. Using the application is very simple: just choose the folder to sync, then it generates a shared secret key for each folder and you can send it to the people you want to share your files. Finally, the software can be synchronized in one direction only shared files, generating a valid secret key for 24 hours or read-only access. Synchronization operations are performed by direct P2P connection so that the speed is surprisingly high. In addition, operations are guaranteed by its protocol 256 bit encryption. Using the program is very intuitive, requiring no special knowledge.