If you need help with spoken communication because of a disability, this website can give you an idea of what's on offer, with details of nearly every communication aid available in the UK - and it's all searchable!
"This section will cover:
1. Math Access Support (Assistive Technology)
2. Concept Support (Instructional sites)
3. Math Apps for use on different iDevices
4. Calculator Options
5. Math Resources
6. Low Tech to High Tech AT Options"