This is syncthing, an open BitTorrent Sync alternative. It is currently far from ready for mass consumption, but it is a usable proof of concept and tech demo. The following are the project goals:

1. Define an open, secure, language neutral protocol usable for efficient synchronization of a file repository between an arbitrary number of nodes. This is the Block Exchange Protocol (BEP).

2. Provide the reference implementation to demonstrate the usability of said protocol. This is the syncthing utility.

The two are evolving together; the protocol is not to be considered stable until syncthing 1.0 is released, at which point it is locked down for incompatible changes.

Syncthing does not use the BitTorrent protocol. The reasons for this are

1. we don't know if BitTorrent Sync does either, so there's nothing to be compatible with, 2) BitTorrent includes a lot of functionality for making sure large swarms of selfish agents behave and somehow work towards a common goal. Here we have a much smaller swarm of cooperative agents and a simpler approach will suffice.

The syncthing documentation is kept on the GitHub Wiki.

MIT