Posted by cliff on May 26, 2015 at 8:02pm
Karl Groves, who has developed a highly useful automated accessibility evaluation tool, is looking for a Drupal developer who can build a plugin for that tool, tenon.io.
Where Karl said "plugin," I am sure he means "custom module." So if module development is your thing and you would like to help more Drupal sites become more accessible, send an email to karl@tenon.io.

Comments
Sad to see this created as a
Sad to see this created as a service instead of an open source project. I'm very much interested in creating a robust tool for checking the accessibility on your site, but not using a paid service.
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-- matt tucker
think Jesse Beach works on an
I think Jesse Beach works on an open source tool -
http://quailjs.org/
Do you know HTML_CodeSniffer
Do you know HTML_CodeSniffer? It's hosted in github
I don't have much time right
I don't have much time right now, but I will try ASAP (which can be long, be patient!) to include this in W3C validator module.
Actually, there is a module
Drupal does have an open-source accessibility tester module.
Charles Belov
Webmaster
San Francisco Municipal Transportation Agency (SFMTA)
Open source Options
@Charles Belov - I don't think that's been maintained.
There's also this now:
https://github.com/dequelabs/axe-rules
https://github.com/dequelabs/axe-core
And also:
https://github.com/Tanaguru/Tanaguru
Lots of interesting options to explore.
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OpenConcept | Twitter @mgifford | Drupal Security Guide