Horodruin

Horodruin is a tool to synchronize 2 or more folders at once. It
provides several filtering options based on file masks, access rights
and more. Unlike many other folder synchronizers, it does not use a
specified target folder but synchronizes folders among each other and
you can limit copy actions with use of the masks or access rights. It s
a little difficult to get started with, but quite flexible once you get
familiar with it. The interface provides a preview that shows you which
files are synchronized and which aren`t.
http://www.snapfiles.com/get/horodruin.html

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