Resources for adults on the autism spectrum

I am trying to help an organization that serves adults who are on the autism spectrum. I was wondering if anyone can help me with the following:

Contacts for programs that have numeracy/high school equivalency classes for those who have disabilities

Examples of teaching materials/resources that might be useful when working with adults who have disabilities who want to improve their numeracy skills.

Examples of gamification software that teach numeracy skills, even if they are a bit childlike in nature.

Thanks,

Daphne Greenberg

Georgia State University