I am also interested in this. Thank you for asking and offering to compile a list. 

I have used National Geographic Kids in grades 2-4.

On Sat, Aug 21, 2021 at 9:01 PM Elaine Shapiro <elaine.shapiro7@gmail.com> wrote:
Our preK-4 school subscribes to World Book online, PebbleGo and PebbleGo Next, and Gale in Context:  Elementary. Many teachers also use EPIC (online books).
In addition, I'd like to provide teachers with a list of websites for general searching, to discourage the "Just Google It" practice.  Which ones do you like?  I am happy to share compiled responses here.

Thank you
Elaine Shapiro
Broad Brook School
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