VOAProp

The late Julian Moss G4ILO wrote a great piece of software (indeed he was a very prolific software writer) called VOAProp. This makes use of  VOACAP "the result of more than 50 years of R&D into HF propagation" and displays it in simple graphical form in a window that you can keep running all the time.
It automatically downloads forecasts from VOACAP and you can select whichever amateur band you are currently operating on and see the predictions for the current day. I have found it invaluable and have made a lot more 30m contacts in one day than the previous year since installing the software.

Here the 40m band is shown with predictions for likely signal strengths
based upon the current time, my QTH and VOACAP predictions.