mcalc is a javascript based microstrip analysis/synthesis calculator. The tool is very easy to use and is fairly accurate. Compared to typical online tools, mcalc uses state of the art equations for the analysis which provides the best accuracy availabl
Transcalc is an analysis and synthesis tool for calculating the electrical and physical properties of different kinds of RF and microwave transmission lines. Transcalc is built using the GIMP toolkit (GTK+) for its GUI interface.