This is Unison version 2.32, kept for compatibility with older
installations on other computer across the network.      -- Matthias Andree

Unison is a file-synchronization tool for Unix and Windows. It allows two
replicas of a collection of files and directories to be stored on different
hosts (or different disks on the same host), modified separately, and then
brought up to date by propagating the changes in each replica to the other.

Unison shares a number of features with tools such as configuration
management packages (CVS, PRCS, etc.) distributed filesystems (Coda, etc.)
uni-directional mirroring utilities (rsync, etc.) and other synchronizers
(Intellisync, Reconcile, etc).

WWW: http://www.cis.upenn.edu/~bcpierce/unison/