An syncthing (<a href="http:&#x2F;&#x2F;syncthing.net" rel="nofollow">http:&#x2F;&#x2F;syncthing.net</a>) is a working unison :)<p>(See <a href="http:&#x2F;&#x2F;popho.be&#x2F;#gift" rel="nofollow">http:&#x2F;&#x2F;popho.be&#x2F;#gift</a> for some more details, search unison)