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	W3C CSS Validation Service - http://jigsaw.w3.org/css-validator/ W3C CSS Validation service enables you to check your CSS code for validity, and warns you if you are using browser specific code.
	W3C HTML Validation Service - http://validator.w3.org A free service from W3C that checks HTML and XHTML code against the W3C Web Accessibility Guidelines.
	Cynthia Says Portal - http://www.contentquality.com/ Accessibility agent offering validation for WAI standards and Section 508 compliance. Includes information and news from the Internet Society Disability and Special Needs Chapter.
	WAVE 3.0 Accessibility Tool - http://www.wave.webaim.org Online tool checks page accessibility, displays page with tags to show good and bad points.
	http://www.wave.webaim.org/index.jsp - http://www.wave.webaim.org/index.jsp Helps you check if your page is accessible to people with disabilities. New version includes tests for section 508.

	Lynx Viewer - http://www.delorie.com/web/lynxview.html Delorie online viewer enables you to view your site in a text browser.
	ATRC Web Accessibility Checker - http://checker.atrc.utoronto.ca/ Analyses a page for conformance with WCAG 1.0 and 2.0, BITV 1.0, Section 508, and the Stanca Act.
	Juicy Studio: Colour Contrast Analyser - http://www.juicystudio.com/services/colourcontrast.php Uses the W3C algorithm to check for sufficient contrast between background and foreground colours.
	AskAlice - http://askalice.ssbtechnologies.com/ Free report (registration required) provides an assessment of a site's accessibility, and information on how to improve.
	Colorblind Web Site Filter - http://colorfilter.wickline.org/ View your actual web pages through the eyes of visitors with three different types of color blindness.

	Accessibility Extensions for Mozilla/Firefox - http://firefox.cita.uiuc.edu/ Toolbar to help users navigate pages, and also tools for developers to check their pages. Installation instructions and documentation.
	AIS - Web Accessibility Toolbar - http://www.nils.org.au/info.aspx?page=614 Toolbar aids manual examination of pages for accessibility features. It consists of a range of functions that: identify components of a web page; facilitate the use of 3rd party online applications; simulate user experiences; provide links to references and additional resources.
	Webthing Accessibility Valet - http://valet.webthing.com/access/url.html This tool will examine your site, and based on the accesibility level you choose, will provide you with a source code listing with marks next to each element which requires attention.
	Q42 Color Blindness Check - http://www.q42.nl/demos/colorblindnesssimulator/ View your website as someone with color blindness would. Appears to work only in IE. Bookmarklet available.
	Color Vision - by Cal Henderson - http://www.iamcal.com/toys/colors/ Test your website foreground/background colors for their contrast and clarity to color blind visitors.

	Color-Blind Design Evaluation - http://newmanservices.com/colorblind Online tool to show what your site colors look like to color-blind people.
	GrayBit Grayscale Contrast Tool - http://graybit.com Converts your page to greyscale to ensure there is sufficient visual contrast between elements.
	UITest.com: Site Check - http://uitest.com/en/check/ Test your website with the W3C, WDG, ATRC, WebAIM, WebXact, Bobby, Cynthia Says, HiSoftware, Site Valet, Colorblindness filter, and Google Viewer, simply by typing your site address once.
	Erigami Accessibility and Quality Validation Tool - http://checkwebsite.erigami.com/accessibility.html Checks web page accessibility on compliance with WCAG and Section 508, including automatic color contrast validation of text elements. It shows issues on a web page screenshot, measures response and download times of every element.
	Vischeck - http://www.vischeck.com Allows the user to see the world as color blind people see it. Checks by images and urls.

	OCAWA Accessibility Validator - http://www.ocawa.com/en/Test-your-web-site.htm Standing for Operational Control and Analysis for Web Accessibility. OCAWA tests the accessibility of your web site using international accessibility standards.
	Accessibility Color Wheel - http://gmazzocato.altervista.org/colorwheel/wheel.php A tool to help choose a color pair with good contrast and suitable for text and background of accessible sites. It simulates also various kinds of color-blindness.
	Anybrowser - screen size testing - http://www.anybrowser.com/ScreenSizeTest.html Enables you to test how your page appears at low screen resolutions - e.g. webtv, 640x480, 800x600.

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