[Zope] Any tool there to draw finite-state-automata-diagrams

[hans]

do document the dialog states im doing w Zope?
It just needs to draw circles and arcs (preferably anchored on the
circles)
with directions and i'd like to attach small text fields
to both circles (=states) and arrows (=transitions).
For db-design, i use S-Designor (free!!) and it sure is one
of the finest tools i've ever seen.
I want something similar just to draw diagrams. Thanks in advance.