Just wanted to share an answer I provided to the question:
Can you name an option for accessible learning management tools?
While I know there are many providers, I could think of the following three:
ATutor; AContent; and ATutorSpaces (Open Source): http://www.atutor.ca
Anthology (formerly Blackboard): https://www.anthology.com/trust-center/accessibility
Digial Chalk: https://www.digitalchalk.com