Pspice - OrCAD PSpice technology provides the best, high-performance circuit simulation to analyze and refine your circuits, components, and parameters before committing to layout and fabrication
BioWin - BioWin
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
AQUASIM - In order to support environmental scientists in finding an «adequate» model of the system...
PCBWeb - PCBWeb is a 100% free Windows desktop CAD application for designing and manufacturing electronics...
DWSIM - DWSIM is an open-source CAPE-OPEN compliant chemical process simulator for Windows and Linux.