Logiciels
W6ELProp™ -- By Sheldon C. Shallon, W6EL - predicts ionospheric (sky-wave) propagation between any two locations on the earth on frequencies between 3 and 30 MHz. YOU HAVE TO HAVE THIS ONE -- HAMS OR SWLers
ON5AU Propagation and Antenna Site -- Loaded with good info and graphs
D-Region Absorption Prediction - From The NOAA/Space Environment Center
Excellent Propagation Info -- By Geoffrey Noles, AE4RV
Radio Propagation -- from Your Remote S-Meter pages