Web Standards - Compliance Tools
Compliance tools help us to test our code against continually improving standards.
HTML Tools
W3C HTML/XHTML Validator - basic evaluation of your website by the W3C committee
CSS Validators
Style Sheet Validator - validate your CSS to ensure cross-browser validity
Accessibility Validators
W3C HTML Validator - A free tool for testing your compliance with the HTML specification. Creating standards-compliant web pages is a significant part of accessibility.
W3C CSS Validator - A free tool for testing your compliance with the Cascading Style Sheets (CSS) specification.
AIS Web Accessibility Toolbar - A free toolbar that includes a wide variety of features that support manual evaluation of the accessibility of web pages.
Web Accessibility Management Tool (WAMT) - This is a free tool from the University of Illinois. It's still in beta, but is already one of the best web accessibility evaluation tools available. Unlike other free web-based tools, it can spider a site and provide evaluations of several pages
WAVE - Provides accessibility feedback with a visual interface
Web Accessibility Toolbar - This free tool operates as a plug-in to Internet Explorer (Windows only).
WebXACT (Bobby) - This is the product formerly known as "Bobby", the original web accessibility checker. In its new incarnation, it checks not only for accessibility but for other "quality" issues such as broken links. The free online tool can only evaluate one page at a time, but a more powerful full-featured version is available for purchase.
Color Tools
Color Blindness Simulation Tool - helps us see what pages look like to those with color blindness
Color Contrast Checking Tool - an objective test for whether your foreground and background provide adequate contrast
Other Tools
Firefox Web Developer Toolbar - adds a menu and a toolbar with various web developer tools
MAGpie - Free software for captioning multimedia