BitTorrent Sync allows you to sync files between all of your devices for free. It features sync unlimited files between your own devices, or share a folder with friends and family to automatically sync anything, file transfers are encrypted, and your information is never stored on a server in the cloud and your data is protected by private keys. BitTorrent Sync is specifically designed to handle large files, so feel free to sync original, high quality, and uncompressed files.
Share anything: Sync uses advanced peer-to-peer technology to share files between devices. No cloud is required. This means there are no accounts, no file size limits, and transfer speeds are never throttled. You are free to share anything and everything you have.
Fast & Easy: Sync is a powerful and flexible application that equips users to get the job done. It is simple enough to share photos with friends, and powerful enough to share terabytes of video between co-workers. The possibilities are endless. Available for Windows, OS X, Linux, iOS, Android, Windows Phone, NAS devices and more.
Built for Trust: Built from the ground up to ensure that you are always in complete control of your files. Data is transferred directly from device to device. Files are never duplicated on to third party servers. Every connection is encrypted and secured against prying eyes. Source: filehorse