The Department of Commerce has made this HF propagation software available free of charge, as is from these web pages
post 27 Dec 2021
Propagation prediction Links →
SpotCollector
Spots of the same station on the same frequency and mode
VOAProp
VOAProp shows you typical propagation for a given hour of the day
W6elprop predicts ionospheric
W6elprop predicts ionospheric sky-wave propagation between any two locations on the earth on frequencies between 3 and 30 mhz
WSPR
WSPR implements a protocol designed for probing potential propagation
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Spots of the same station on the same frequency and mode
VOAProp shows you typical propagation for a given hour of the day
W6elprop predicts ionospheric sky-wave propagation between any two locations on the earth on frequencies between 3 and 30 mhz
WSPR implements a protocol designed for probing potential propagation