eispice is a clone of the Berkley Spice 3 Simulation Engine with a Python based front-end. It contains a subset of standard spice device models and a set of unique models that are targeted towards PCB level Signal Integrity
py2port is a tool for performing two-port and one-
port analysis on linear circuits. It was developed
for analyzing PCB power-distribution-systems and
lossy transmission lines.
A .NET component to create PDF documents without using Adobe Acrobat.
A Java plotting library.