The topic of the Tuesday night Hamlet Net was “spotting sites.” Here is a list of the sites that were mentioned:
https://hamspots.net/
https://dxheat.com/dxc/ – Has a “heat map” on the right side of the page. Set your continent, and it will show you graphically which bands have spots appearing (i.e. QSOs occurring) to various continents.
https://dxwatch.com/
https://www.dxmaps.com/spots/mapg.php?Lan=E
http://reversebeacon.net/
http://dxsummit.fi/#/
https://www.wsprnet.org/drupal/wsprnet/map – WSPR map (if not running WSPR, you can still use to get a feel for band openings. WSPR is a great program to try if you want to see how far your station can reach.)
https://pskreporter.info/pskmap.html – Despite the name, it includes information on many modes (digital and non-digital)
https://gridtracker.org/ – Windows application to display contacts on a map as well as many other features.