Low Tech communication aids are defined as those that do not need batteries, electricity or electronics.

Link: Assistive Technology

Link: Basic Technology
Link: Wikipedia on AT

Link: Assistive Technology
Link: Low and Mid Tech Tools for Students with Special Needs

Below: Braille Notetaker: assistive technology for the blind video


Below: SEM Glove
Helps people with a weak hand grip based on robot technology



To sum it all up!