HZ1JW Propagation Map
This tool provided by HZ1JW visualizes the behaviour of the propagation on the HF bands. Besides the information for the daily QSO chances, it is also a great tutorial to understand the interaction of the day-night cycles, the earth magnetosphere and solar activity. This platform is quite useful to show the dead zone. For the higher bands, the propagation waves are a good graphic tutorial for the hops. I do recommend this tool to explain the HF bands behaviour to ham radio novices.
Radio Coverage Simulation Platform
This webpage by VE2DBE provides simulations for radio coverage based on public domain geo data. New user has to register. It’s free of charge for radio amateurs.