Color-Blind Design Evaluation
- Online tool to show what your site colors look like to color-blind people.
- http://newmanservices.com/colorblind

Accessibility Color Wheel
- 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.
- http://gmazzocato.altervista.org/colorwheel/wheel.php

AIS - Web Accessibility Toolbar
- 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 a
- http://www.nils.org.au/info.aspx?page=614

Wave
- Helps you check if your page is accessible to people with disabilities. New version includes tests for section 508.
- http://www.wave.webaim.org/index.jsp

ATRC Web Accessibility Checker
- Analyses a page for conformance with WCAG 1.0 and 2.0, BITV 1.0, Section 508, and the Stanca Act.
- http://checker.atrc.utoronto.ca/

Erigami Accessibility and Quality Validation Tool
- 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.
- http://checkwebsite.erigami.com/accessibility.html

Juicy Studio: Colour Contrast Analyser
- Uses the W3C algorithm to check for sufficient contrast between background and foreground colours.
- http://www.juicystudio.com/services/colourcontrast.php

UITest.com: Site 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.
- http://uitest.com/en/check/

Webnauts Net
- Offer a combined interface to collection of tools (W3C, CSE, and Cynthia validators, and also a Lynx simulator) for checking adherence to standards, mark-up and accessibility.
- http://www.webnauts.net/check.html

Q42 Color Blindness Check
- View your website as someone with color blindness would. Appears to work only in IE. Bookmarklet available.
- http://www.q42.nl/demos/colorblindnesssimulator/

Color Vision - by Cal Henderson
- Test your website foreground/background colors for their contrast and clarity to color blind visitors.
- http://www.iamcal.com/toys/colors/

Hermish
- A free on-line accessibility and browser compatibility checker. Hermish will test your web pages for accessibility issues and provide a detailed report.
- http://www.hermish.com

HiSoftware.Com Accessibility and Quality Tester
- Tests to Section 508 and WCAG standards.
- http://www.hisoftware.com/accmonitorsitetest/

WAVE 3.0 Accessibility Tool
- Online tool checks page accessibility, displays page with tags to show good and bad points.
- http://www.wave.webaim.org

Anybrowser - screen size testing
- Enables you to test how your page appears at low screen resolutions - e.g. webtv, 640x480, 800x600.
- http://www.anybrowser.com/ScreenSizeTest.html

Lynx Viewer
- Delorie online viewer enables you to view your site in a text browser.
- http://www.delorie.com/web/lynxview.html

Webthing Accessibility Valet
- 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.
- http://valet.webthing.com/access/url.html

W3C CSS Validation Service
- W3C CSS Validation service enables you to check your CSS code for validity, and warns you if you are using browser specific code.
- http://jigsaw.w3.org/css-validator/

Bobby WorldWide
- Validator that checks pages for WAI and 508 accessibility standards.
- http://bobby.watchfire.com/bobby/

Vischeck
- Allows the user to see the world as color blind people see it. Checks by images and urls.
- http://www.vischeck.com

W3C HTML Validation Service
- A free service from W3C that checks HTML and XHTML code against the W3C Web Accessibility Guidelines.
- http://validator.w3.org

Colorblind Web Site Filter
- View your actual web pages through the eyes of visitors with three different types of color blindness.
- http://colorfilter.wickline.org/

Cynthia Says Portal
- Accessibility agent offering validation for WAI standards and Section 508 compliance. Includes information and news from the Internet Society Disability and Special Needs Chapter.
- http://www.contentquality.com/