This is the syncthing project. The following are the project goals:
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Define a protocol for synchronization of a file repository between a number of collaborating nodes. The protocol should be well defined, unambiguous, easily understood, free to use, efficient, secure and language neutral. This is the Block Exchange Protocol.
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Provide the reference implementation to demonstrate the usability of said protocol. This is the
syncthingutility. It is the hope that alternative, compatible implementations of the protocol will come to exist.
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.
Take a look at the getting started guide.
As of v0.7.0 and onwards, git tags and release binaries are GPG signed with the key BCE524C7 (http://nym.se/gpg.txt). For release binaries, MD5 and SHA1 checksums are calculated and signed, available in the md5sum.txt.asc and sha1sum.txt.asc files.
The syncthing documentation is on the discourse site.
All documentation and protocol specifications are licensed under the Creative Commons Attribution 4.0 International License.
All code is licensed under the MIT License.