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Accessibility Resources (Tools)
https://addons.mozilla.org/ca/firefox/addon/wcag-contrast-checker/
Firefox addon; very complete sidebar contrast checker, on top of which is provided a filter to simulate 4 types of colorblindness.
http://accessibility.oit.ncsu.edu/tools/color-contrast/
Online tool for analyzing color combinations that meet WCAG 2 a11y specifications.
http://accessibility.oit.ncsu.edu/tools/color-extractor/
Extracts colors from the page CSS files and feeds them to Color Palette Accessibility Evaluator (see above).
http://www.paciellogroup.com/resources/contrastanalyser/
Standalone tool; provides a pass/fail check for WCAG 2.0 contrast criteria; simulates certain visual conditions.
http://www.stainlessvision.com/blog/projects/colour-contrast-visualiser
SWF tool with Photoshop style color picker.
https://addons.mozilla.org/EN-US/firefox/addon/openajax-accessibility-exte/
My favourite sidebar (full WCAG support with the possibility to generate and export reports).
https://addons.mozilla.org/en-uS/firefox/addon/juicy-studio-accessibility-too/
Good for checking ARIA features, tables and color contrast.
https://addons.mozilla.org/en-US/firefox/addon/ainspector-sidebar/
Very similar to OAA extension, no reports, docs and latest release on GitHub.
https://addons.mozilla.org/en-US/firefox/addon/wave-toolbar/
Nice visual tool, Chrome version is more recent.
https://addons.mozilla.org/en-US/firefox/addon/accessibility-evaluation-toolb/
Good set of checkers, no updates for a while.
http://jimthatcher.com/favelets/
Several handy a11y assessment favelets/bookmarklets.
https://addons.mozilla.org/ca/firefox/addon/opquast-desktop/
Originally in French; A11y, SEO and more.
http://ncam.wgbh.org/invent_build/web_multimedia/tools-guidelines/favelet
Not updated for a while, but still works well.
http://achecker.ca/checker/index.php
Full HTML, CSS, WCAG & Section 508 online assessment tool.
http://fae20.cita.illinois.edu/
Sitewide evaluation and reports (requires registration).
Choosing an Automated Accessibility Testing Tool: 13 Questions you should ask
Requires Node.js and PhantomJS; Custom Reporters option.
http://quailjs.org/
jQuery plugin; comes with a collection of 250 tests from which to pick and choose or write our own in YAML/JSON.
https://github.com/Tanaguru/Tanaguru
Very complete website a11y assessment tool; basic and advanced Scenario audits based on Selenium).