<strike>I ended up choosing [Unison][1], which supports Linux, FreeBSD, Windows and Android - the full set of OSs I use on a regular basis.</strike>

See [https://android.stackexchange.com/questions/65691/synchronising-files-over-ssh][2] for my replacement for Unison.


  [1]: http://www.cis.upenn.edu/~bcpierce/unison/
  [2]: https://android.stackexchange.com/a/186319/56413