That's potentially interesting from the OSX point of view as
well.
The VDE website (wiki) has conflicting info on it, but mentions in the
notes for its System Requirements that it works on OSX.
We do not release VDE binaries for MacOSX (our team maintains the packets
only for Debian) but the source code can be compiled on MacOSX.
We do have MacOSX users of VDE (and FreeBSD, NetBSD, too).
We do not test the source distribution on MacOSX, so if you'll run into
some issue on the latest versions of OSX, let us know. We'll be glad to
update the code to satisfy all possible VDE users.
renzo