Xnec2c is a high-performance multi-threaded electromagnetic simulation package to model antenna near- and far-field radiation patterns for Linux and UNIX operating systems.

Fast, interactive Julia/GTK+ plots (+Smith charts +Gtk widget +Cairo-only images)

Parametric analysis/visualization of model/measurement/simulation results

Smith Chart

This is a collection of open source, free to use and/or abandonware tools for Amateur radio.

CAD tool for designing RF and microwave circuits.

Graphical Impedance Matching and Smith Chart - cloned from floppy drive source

Designing Amplifier based on S-parameters

A quick start Blazor server project that let you know how to create and configure the Syncfusion Blazor Smith Chart using Visual Studio 2019.

A quick start project that shows how to create and configure the Syncfusion Vue Smith Chart component in a Vue application. This sample explains how to populate list data, add legends, and enable data labels and tooltips.