> (sigh, it seems the tech community has become blind to anything that isn't heavily blogvertised.)

There's so much released and so much noise, it's hard to keep track of all the good things that come out - especially if they're not mentioned within their tribe of friends/followed ppl.

I don't know how to get round that - the web is huge and no one can keep track (or have a network that touches) all of the open source releases.

Unison is no longer under active development, right? Would love to use it but going forward, is there a big enough community to fix bugs, add new features etc?

http://www.cis.upenn.edu/~bcpierce/unison/status.html

It has not been a problem in my experience. There isn't major development (proper support for inotify and flexible topology would be nice), but Unison does what it says extremely solidly. There's certainly an active user community and the occasional bugfix/feature. Reread that notice again concentrating on the good parts, and take a look at the changelog. There's certainly activity, it's just not time intensive - this is both the blessing and apparent curse of using a high level language.

Unison requires a bit more administrative work to set up and maintain than BTSync, in my experience. People really like the Dropbox experience.