Propagation websites:
https://www.qsl.net/4x4xm/HF-Propagation.htm
http://www.astrosurf.com/luxorion/qsl-propa4.htm
https://www.hamuniverse.com/hfbands.html
https://www.rcarc.org/presentations/HFPropagation.pdf
https://www.ng3k.com/misc/n4kgprop.html
https://www.qsl.net/ad4dx/pdf/radio02.pdf
http://www.nadxc.org/wp-content/uploads/2020/05/The-Magic-of-SW-Morning-Propagation.pdf
https://www.n1fd.org/2017/12/03/propagation-prediction-websites/
https://hamradiofornontechies.com/current-ham-radio-conditions/
https://weatherspotter.net/propagation.php
https://w3kwh.com/current-band-conditions/
https://www.qsl.net/4x4xm/Ham-Band-Conditions.htm
https://potalife.com/dashboard/
Digital modes propagation:
http://spotty.modern-industry.com
https://www.reversebeacon.net/
Propagation dashboard:
https://github.com/accius/openhamclock
Beacons:
https://www.programmi-italiani.com/beacons/index.html