Development/Testing
Incorporate accessibility into all your System Development Life Cycle (SDLC) processes: requirements analysis, design, implement, test and deploy.
Building accessibility into web and application development
Understanding the Web Content Accessibility Guidelines (WCAG 2.0), why and when the guidelines are important, and how to apply them is addressed in the WCAG 2.0 Top Ten Check Points webinar. This webinar provides an introduction to WCAG 2.0 for web application developers and business analysts. (Audio Transcript PDF)Validators and Testing Tools
Testing for accessibility along the way can help to identify problems early in the process. While there are many aspects to accessibility testing and validation, there are also many tools available.
The worldwide web consortium (W3C) has posted an open call to tools and resources for evaluating web accessibility. Keep in mind that anyone can post their tool and there is no review or feedback mechanism: W3C's Web Accessibility Evaluation Tools List.
Here is a shortlist of some tools that we've found helpful.
(Note: When using these tools, be sure to note carefully what standards (if any) a particular product follows such as WCAG 1.0 instead of the more recent 2.0. This list does not constitute endorsement of any particular product or service. All tools have free versions available.
General Testing:
Color and Contrast
Captioning and Media