Day 291 of 366: Any other educational eBook vendors?

I am finalizing my notes (as final as they could be) on the different educational eBook vendors. This is the list of options, big and small, that I examined.

Are there any school-focused eBook providers that I have missed? 

  • Tumblebooks
  • Follett Shelf
  • Mackin Via
  • Gale
  • ABDO
  • Scholastic Storia
  • Overdrive
  • Subtext
  • 3M Cloud Library