I really dislike that the Syncthing website appears to have mastered modern "we won't tell you what it is" marketing speak. Did I miss something and this is now a game with scoring for speaking around topics?
"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."
Oooooooh, new shiny with buzzwords! What's it do? Is it a replacement for Chrome's cross-system syncing? Firefox Sync (which I think can already be self-hosted actually)? Password managers? Maybe hosted Exchange? Wait, it's not?
Oh, wait, it's a multi-system file syncing package. Well why didn't you say so while you were telling me I deserved to have control and blah blah blah. Cripes, it even says "a large number of features have already been implemented" then provides a list that implies that running on Windows, OSX, Linux, the BSDs and Solaris is one of those features.
There are several places where what it does is implied, but to actually get to a statement of "For this guide let’s assume you have two machines between which you want to synchronise files." I have to go to the bottom of the site, click Docs, then either click on Introduction and Getting Started (in the documentation structure) or click on the "getting started guide" link within the first paragraph of the Introduction.
grmbl get off my lawn
Edit: I should note, I'm not talking about the 1.0 announcement on their forums - that's for folks already actively involved with it. I'm talking about the very spare https://syncthing.net