GNU Radio - GNU FSF Project
- A collection of software (combined with minimal hardware), allows the construction of radios where the actual waveforms transmitted and received are defined by software. Latest release is 3.1.2, 2008-03-24.
HPSDR - High Performance Software Defined Radio
- A free and open source hardware and software project intended as a "next generation" Software Defined Radio (SDR) for use by ham radio users and Short Wave Listeners (SWLs).
Ham Radio Control Libraries (Hamlib)
- The purpose of this project is to develop flexible and portable shared libraries that offer a standardised API to control any radio-oriented equipment through a computer interface. Latest release is 1.2.6.2, 2007-06-30.
KPSK -- PSK31 for KDE 3.x
- PSK31 digital radio communications application for use by licensed amateur radio operators and designed specifically for the KDE 3.x desktop environment.
KRadio Homepage
- Software for listening to radio on the KDE desktop.
LinPac Packet Radio Terminal
- A modular console-oriented packet radio terminal for Linux with mail client; latest release is 0.16, 2002-07-29. N.B. : As of 2006-05, this project is looking for a maintainer.