Ham Radio Software Suppliers

 
rt systems-Radio Programming Made Easy
https://www.rtsystemsinc.com/default.asp

Ham Radio Deluxe Softwarev
https://www.ham-radio-deluxe.com/

EZNEC Antenna Modeling Software
http://eznec.com/

4nec2: NEC based antenna modeler and optimizer
http://www.qsl.net/4nec2/