| www.rtty.com | (RTTY) |
| http://aintel.bi.ehu.es/psk31.html | (The Official PSK31 Website) |
| PSK31: A new radio-teletype mode with a traditional philosophy. Peter Martinez, G3PLX (see above link) | (PSK overview) |
| http://www.psk31.com/ | (PSK31) |
| http://www.winpskse.com/ | WinPSKse |
| http://www.dx4win.com/ | DX4WIN |
| http://hrd.ham-radio.ch/psk31deluxe.html | PSK31 Deluxe |
| http://www.qsl.net/winwarbler | WinWarbler |
| http://www.packetradio.com/ | (RASCAL-Excellent Interface!) |
| http://www.westmountainradio.com/ | (RIGblaster) |
| http://www.w5bbr.com/soundbd.html | (Soundcard Interfacing) |
| http://www.tigertronics.com/ | (SignaLink by Tigertronics) |
| http://www.microham.com/mk.html | (microHAM-includes CW keyer) |