Karwai Pun is an interaction designer currently working on Service Optimisation to make existing and new services better for our users. Karwai is part of an accessibility group at Home Office Digital, leading on autism, and has created these dos and don'ts posters as a way of approaching accessibility from a design perspective.
I *think* this is a link to Chris Woodin's videos but it might just be to one of them. He is an expert at teaching math to folks who need things physical and visual and concrete. He's got some books and resources and lots of good videos that show students engaged in learning math.
They're *not* OER but I'll be using them to inspire making OER.