Total Validator Tool
Why use separate validation tools to check your web pages when you only need one? The Total Validator Tool performs the most important validations on your web pages: True (X)HTML validation against published W3C/ISO DTDs; accessibility validation against the W3C and US Section 508 guidelines;... You should ensure your sites conform to the W3C WAI Accessibility Guidelines, (and that also means strictly W3C validated HTML), or US Section 508 standard, if you want your site to be accessible to all.
http://www.totalvalidator.com/downloads/TotalValidator_F200.exe - 2Mb - Download - Screenshot

Course Genie
Like Magic, Course Genie allows you to quickly and easily convert Microsoft Word documents into interactive online courses and web pages. There's no need to spend hours learning expensive & cumbersome 3rd party software to author online courses and web pages when you can simply use what you... Course Genie will enable authoring of content compliant with SENDA, W3C WAI and Section 508, and even includes an Accessibility Checker, allowing your academics to check their content before generating the final content package.
http://horizonwimba.com/products/c...e/release/CourseGenie_v2_0_SE.zip - 16Mb - Download - Screenshot

CSE HTML Validator Professional
CSE HTML Validator Professional is a fast, powerful, highly user configurable, and easy to use professional web development tool that helps you create syntactically correct and accessible HTML, XHTML, and CSS documents. The new HTML Tidy Tool can even fix HTML and XHTML (and more). ... The latest version of CSE HTML Validator includes accessibility checking (Section 508 and WCAG), CSS syntax checking, link checking, spell checking, a powerful, easy to use, integrated HTML/text editor, an integrated web browser (browse the web while you validate the pages), and a powerful Batch Wizard that...
ftp://ftp.htmlvalidator.com/pub/htmlval/csesetup.exe - 4Mb - Download - Screenshot

Xceed SmartUI for .NET
Xceed SmartUI for . NET provides the visual controls you need to create user-friendly, state-of-the-art Windows Forms applications quickly and easily. It supports real themed or simulated Windows XP, Office XP, Office 2003 and classic Windows styles. ... 0, which results in Section 508 compliance. ... This means that SmartUI controls act as Active Accessibility servers, exposing information such as the name, the type, the location and the current state of SmartItems. ... NET features support for Microsoft Active Accessibility 2.
http://www.download.xceedsoft.com/xceedSmartUiNet.exe - 16Mb - Download - Screenshot