http://www.ve7cc.net/  A cluster client
http://www.echolink.org/  VOIP for licensed amateurs.
http://gpredict.oz9aec.net/download.php - Free satellite tracking software.
http://www.g4fon.net/  An excellent Koch CW trainer.
http://www.ham-radio-deluxe.com/ - The ultimate all in one package.
http://www.n1mm.com/  My personal choice for contest logging.
http://www.digipan.net/  powerful but lightweight PSK software
http://www.mixw.net/  multi digimode software
http://www.g4hfq.co.uk/index.html  Memory program software
http://www.ham-radio-deluxe.com/Programs/FT817Commander.aspx  FT-817nd programming
http://www.dxlabsuite.com/ A combined set of DX/propagation softwares
http://www.kc8unj.com/ Home of VX-7 Commander, VX-2 Commander by Jim Mitchell - KC8UNJ
http://www.ve3sqb.com/ Antenna design programs