So far a strong and unexpected (to me) though obvious contender is
LT-SPICE's schematic editor.
It does NOT allow PCB fabrication but does allow very quick and intuitive
simple schematic production for GUI aware users.



http://www.linear.com/designtools/software/?gclid=3DCNCm8KnLzbMCFbFTpgodPj0=
ARg#LTspice



                      Russell
--=20
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