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
Oregano - oregano - An electrical engineering tool for GNOME
AQUASIM - In order to support environmental scientists in finding an «adequate» model of the system...
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming