Someone posted this link to a Case tool:
http://www.ccas.ru/~gurov/ftp/Editors/CASE/Vinsent/
Unfortunately it's in Russian, which I know nothing about, and it
doesn't seem to have been worked upon since 1997.
I don't know the strength of this tool, as I can't understand the
description, but can this be the best OSS-contender with no work being
done for two years?