Blackboard Ally
See the Help Desk: Accessible Blackboard at https://sites.google.com/site/helpdeskaccessibleblackboard/
UDOIT (Like Ally for Canvas)
UDOIT Information https://community.canvaslms.com/docs/DOC-6504
Introducing the UDOIT Accessibility Checker for Canvas [Clemson] http://blogs.clemson.edu/online/2017/04/21/introducing-the-udoit-accessibility-checker-for-canvas/
UDOIT User Guide https://lor.instructure.com/resources/6bf40e8d2254428cbbfd213586c84406