Stephanie Leary

Provides a report on the accessibility of your image files.
The initial version provides a list of images without alt text in Settings → Accessibility Report. It also offers an option to turn on an ‘Alt/Transcript’ column in the Media Library, where you will see either a check mark or a link to add alt text.
Other forms of media will be added in future versions. Visit https://github.com/sillybean/media-ally to contribute your ideas.

Media Ally

Provides a report on the accessibility of your media files.

Amit Moreno

Codenroll

Adds an accessible way to skip to page sections, as required by WCAG 2.0 for all levels.
This plugin is provided by Amit Moreno and the team of Codenroll to help make the internet more accessible for people with disabilities. please aware that the plugin authors is not responsible to the user or to any third party for any direct or indirect damage of any kind from any use of this plugin.

AccessibleWP – Accessibility Skip-Links

Adds an accessible way to skip to page sections, as required by WCAG 2.0 for all levels.

Media Ally vs AccessibleWP – Accessibility Skip-Links