The archive is currently for MacOS (as is Leonardo), but with full source code; I'm gonna try and package it for unices (targz)
Additionally Leonardo has been discontinued and superseded by "The Leonardo Computing Environment" at : http://www.leonardo-vm.org/ it now runs on top of a multiplatform Leonardo VM engine.
It may prove interesting to attempt a Lua5 implementation on top of this new universal VM. I'm expressly thinking of visualisation and training purposes.
UPDATE: The Leonardo VM project is no longer on-line and I can't get in touch with the old website and SVN repository admins.
cheers, [Sandro Bilbeisi]