Syncthing replaces proprietary sync and cloud services with something open, trustworthy and decentralized. Your data is your data alone and you deserve to choose where it is stored, if it is shared with some third party and how it's transmitted over the Internet.
Rakoshare is a sharing tool to synchronize a folder on multiple computers with no configuration.
It was inspired by Bittorrent Sync and aims to be an Open Source alternative. Internally it reuses the Bittorrent protocol to build a more dynamic protocol.