Website Accessibility Standards and Guides

Trace Research and Development Center
Provides resources for the design of accessible web pages.
 
Web Accessibility Initiative (WAI)
Provides strategies, guidelines, and resources to make websites accessible to people with disabilities.
 
Website Tips on Accessibility
Provides extensive information and resources to assist in website accessibility.

Web Content Accessibility Guidelines (WCAG)
World Wide Web Consortium site for accessible website standards

Captioning Videos for Online Distribution

National Association of the Deaf (NAD): Captioning for Access

BBC says everybody can benefit from closed captions

Subtitle Workshop: Free tool to create subtitles outside of YouTube

Website Accessibility Checkers

WAVE Web Accessibility Evaluation Tool

AChecker