I like the guys at Airhead and not just because their company mission statement is "Harness the power of the Cloud to provide more learning for less money." Their flightdeck product is best of breed and well worth considering if you use Google Apps for Education or Microsoft 365 for Education in your establishment.
However, another great service that they offer is Airbase and I am really not sure how I missed this as it was being developed. In a nut-shell Airbase is a simple free to use directory of education resources. What is nice about it is that you can search by subject area (eg: Geography) and / or by age group.
Chack it out and try a few searches for resources at: https;//airbase.airhead.io