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)

NanoVNA RF learning board with SMA connectors for practical demos, experiments, and teaching.

Parametric analysis/visualization of model/measurement/simulation results

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.

Smith Chart

RF matching network synthesizer, optimizer, and S-parameter analyzer with live VNA control

GTK4 Drawing Area widget displaying a detailed Smith chart

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

Designing Amplifier based on S-parameters

⚡ Zero-dependency RF & transmission line calculator CLI. Gamma, VSWR, Smith Chart, skin depth, path loss, dB conversions — all from the terminal.

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

Yet Another BAsic Smith Chart gizmO

Python wrappers for RF lab instruments — Mini-Circuits USB power sensors and Agilent E5061B ENA — with FastAPI servers for n8n and a live Smith chart viewer.

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.