Best Open Source Ham Radio Software 2026

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Browse free open source Ham Radio software and projects below. Use the toggles on the left to filter open source Ham Radio software by OS, license, language, programming language, and project status.

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1

fldigi

Ham Radio Digital Modem Application

Fldigi is a modem program for most of the digital modes used by radio amateurs today: CW, PSK, MFSK, RTTY, Hell, DominoEX, Olivia, and Throb are all supported. It can help calibrate a sound card to a time signal and do frequency measurement tests. NOTICE: You must proceed to the Files section to locate the correct fldigi, flrig etal download for your particular operating system. Do not blithely use the big green Download button! Use the "Files" menu item or the "Browse All Files" link.

37 Reviews

Downloads: 3,683 This Week

Last Update: 2026-01-02
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2

Trusted QSL

Open source libraries and utilities to support using digital signatures for Amateur radio QSL information.

5 Reviews

Downloads: 47 This Week

Last Update: 3 days ago
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3

QAntenna

QAntenna is able to show antennas in a 3D plot, and calculate it's radiattion pattern. It is capable of working with many antennas at the same time.

Downloads: 5 This Week

Last Update: 2014-03-16
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4

Xdx DX Cluster client

DX Cluster client for radio amateurs

A handy stand-alone GTK+ client for accessing your favorite DX Cluster or Reverse Beacon Net server via telnet over TCP/IP.

1 Review

Downloads: 2 This Week

Last Update: 2022-09-11
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5

VGXTracker

STM32F4 APRS Tracker/Digipeater/IGate/Monitor

STM32F4 APRS Tracker & Frame monitor

Downloads: 0 This Week

Last Update: 2014-03-01
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