Available for multiple platforms, sees BPSK or QPSK with a Viterbi decoder. Download available
http://www.kender.es/~edu/psk31.html
Contains software for download, links to related content and manufacturers.
http://www.nwnet.co.uk/dexter/link.html
Free ham radio logging software based on Access 97 or Access 2000.
http://digilander.iol.it/i4ifl
Agilent online Java applet to display standing waves as a function of reflection coefficient.
http://www.educatorscorner.com/experiments/spectral/SpecAn9.shtml
Shareware and freeware to get the most out of your hobby.
http://www.ncsl.co.uk/ncsl.html
Contest logging program.
http://www.qth.com/tr/
Download available of the viewer add-on for VE3SUN's DX Monitor software.
http://www.powerup.com.au/~ozhelp/dxmonviewer.htm
Makes software for predicting amateur radio propagation.
http://members.aol.com/skywavetec/index.html