www.rsgb.org/propquest – FoF2 critical frequency and extrapolated MUFs

www.rsgb.org/predtest – ITURHFPROP-powered predictions (G4FKH)

www.rsgb.org/proppy – ITURHFPROP-powered predictions (HZ1JW)

www.rsgb.org/voacap – VOACAP-powered predictions (OH6BG)

www.rsgb.org/g0kya – At-a-glance hourly VOACAP predictions (G0KYA)

www.predtest.uk – Predtest ITURHFPROP predictions

soundbytes.asia/proppy/ – Proppy ITURHFPROP predictions

www.voacap.com – VOACAP Online