An excellent Assistive Technology overview from Understood.org, a non-profit dedicated to serving families of kids who learn and think differently. Many of the concepts can be applied to the use of AT by teens and adults. Besides AT, the main site, Understood.org, has many suggestions for overcoming learning and behavioral challenges.
Website, weekly blog and YouTube channel that regularly provides practical lessons to help promote social skills and communication for students with special needs. Many of the lessons can be successfully used with adults with cognitive disabilities.
PrAACtical AAC supports a community of professionals and families who are determined to improve the communication and literacy abilities of people with significant communication difficulties.