Don Johnston - Educational software for students with reading or writing difficulties, or physical disabilities. Cognitive Designs - Educational and clinical tools to teach and treat children with autism or other developmental and learning disorders. Offers the full range of materials which make up the Miller Method. Different Roads to Learning - An on-line catalog specializing in learning materials and playthings for children with developmental delays and challenges. Educational toys and materials that stimulate the skills leading to speech and language for challenged children ages 2 to 10. ABA Materials - Produces CD-ROM flash cards from thousands of color photo images to teach speech, language, and communication. Cadan Assistive Technologies - Specializes in augmentative and alternative communication products for visually impaired, deaf and disabled students. Liberator - Offers special education software, communication systems and switches. Offers free demos.