an object oriented digital circuit simulator
http://www.elender.hu/~lfeher/exor/
The program autochar is used to automate the characterization of digital circuits.
http://www.cadfarm.com/spice.htm
Simulates the changes of states of a NutChip programmable integrated circuit.
http://digilander.libero.it/maxnegro/Software1.html
http://download.uni-hd.de/ftp/pub/cica/win3/demo/wbrddemo.zip