American Radio Relay League: www.arrl.org

Deutscher Amateur-Radio-Club e.V: www.darc.de

PSK31 Home Page: aintel.bi.ehu.es/psk31.html

WinPSK: www.qsl.net/ae4jy/winpsk.htm

LinPSK: linpsk.sourceforge.net

Troll Tech (Qt): www.trolltech.com

FFTW (Fastest Fourier Transform in the West): www.fftw.org

PortAudio—portable cross-platform Audio API: www.portaudio.com

Debian package for LinPSK: packages.debian.org/unstable/hamradio/linpsk

Amateurfunk mit Knoppix / Amateurradio with Knoppix: www.afu-knoppix.de

WM2U's PSK31 Page: www.qsl.net/wm2u/psk31.html

Q code: three-letter code signals: en.wikipedia.org/wiki/Q_code

Amateur Data Interchange Format: www.hosenose.com/adif

KDevelop: Integrated Development Environment for KDE: www.kdevelop.org