AbleData - Searchable database of 19,000 + assistive technology products. Site maintained for the National Institute of Disability Rehabilitation Research of the U.S. Department of Education.
AssistiveTech.net - Online database of assistive and adaptive technology products, as well as community resources.
Closing the Gap - Computer technology resources and products for special education and rehabilitation.
Infogrip - Wide selection of computer access products, including one-hand keyboards, voice recognition software, mouse alternatives, touch screens, switches and switch access products.
Microsoft Accessibility - Offers information and tools that help remove barriers and make computers more accessible to the disabled.
RehabTool.com - Helps children and adults with disabilities regain independence, control and productivity through leading edge assistive and adaptive technology. Offers free product search and referrals.