After a bit of searching I finally found:
A github site - GitHub - dbalmain/ferret: Ferret: the extensible information retrieval library for ruby.
And a git repository - git://github.com/dbalmain/ferret.git
They were apparently created by a user called ‘dbalmain’, suspiciously
Is this the oft mentioned but thus far invisible git repository? It’s
inactive since June and Dave seems to be silent. I do hope he hasn’t
by a bus .