The AInspector tool is a free sidebar utility on Firefox that provides a summary of violations divided by WCAG rule category. It also maps the violated WCAG guideline with information about why/how it is violating the rule. Users can drill down further by selecting the element and displaying the related HTML code in the bottom part of the screen. AInspector was developed at University of Illinois.
Provide automated detection of accessibility issues
Reveal what a screen reader should say for interactive elements (the accessible name computation)
Give practical suggestions to improve accessibility and check 508 compliance
When providing downloadable documents there are steps you can follow to evaluate how accessible they are to disabled users. When possible, provide multiple formats (ex. PDF and Word) so that users can pick their preferred file type. Below are some curated resources that explain how to create accessible documents in multiple formats: