The Drupal Accessibility group is looking for a broad range of help in making Drupal more accessible. Some of them are:
We need help with unit testing for accessibility issues in Drupal.
If you've got mad skills at this, we need your experience to help write better tests to verify that accessibility is maintained.
We need help with automated testing tools.
Ideally every aspect of Drupal Core and all Contributed modules & themes will go through automated accessibility testing. Tools like axe-core can do this, but it requires additional integration.
We need more testers.
We particularly want users who can test with Dragon Naturally Speaking. Aural interfaces are going to be particularly important for websites, but the Drupal Community does not have a lot of experience building aurally pleasing interfaces.
We use Drupal.announce() in Drupal Core, but we need to use it a lot more.
Modules & themes in Contrib both need better use of this JavaScript class to consistently integrate aria-live implementations.
We don't know what we don't know.
Please tell us what we are missing.
For more on Drupal Accessibility - see the Drupal Accessibility Quicksheet in the LEARN section of this DeveloperSpace