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.
SD is a peer-to-peer bug tracker that’s built for sharing and use both online and offline. With SD, you can sync your bugs back and forth between other instances of SD, and even between SD and other bug trackers that SD supports (RT / Hiveminder / Trac / GitHub / Google Code).
Keeping two or more copies of the same document synchronized with each other in real-time is a complex challenge. This paper describes the differential synchronization algorithm. Differential synchronization offers scalability, fault-tolerance, and responsive collaborative editing across an unreliable network.