Totally Automated Accessibility Scanner od Skeletonxf

Totally Automated Accessibility Scanner is a completely free tool which automatically detects and reports common accessibly violations on your website.
Totally is designed to help you identify a number of accessibility concerns relating to the comprehensive guidelines maintained by the WC3 in the WCAG without prior accessibility knowledge to make sense of the results.

Totally is completely free to use even for commercial use as it is MIT licensed.

Source code:
https://github.com/Skeletonxf/totally-automated-a11y-scanner
https://gitlab.com/skeletonxf/totally-automated-a11y-scanner
The GitHub repository is a mirror of the GitLab repository but issues and pull requests to either will be accepted.

Totally Automated Accessibility Scanner is based on the bookmarklet called tota11y that was developed by Khan Academy and Totally Automated Accessibility Scanner continues to use much of tota11y's UI and auditing code, however Khan Academy has not endorsed and is not in any other way involved in this project.

Reference on the test suite TASS has: https://skeletonxf.gitlab.io/totally-automated-a11y-scanner/#rules-section