Color Contrast Checker by WebAIM
Color Blindness Filter by Toptal
Use this filter to test web pages for color blindness https://www.toptal.com/designers/colorfilter/
Accessible PDFs - Adobe Acrobat Pro and Microsoft Word
How to make your Microsoft Word document accessible by Microsoft:
How to create and verify accessible PDFs by Adobe:
How to create accessible forms inside Adobe:
How to create and repair tables inside Adobe:
How to use the accessibility checker by Adobe:
How to repair or remediate old PDFs by Adobe:
Web Accessibility Testing Tools
WAVE by WebAim http://wave.webaim.org/
SortSite by Powermapper https://www.powermapper.com/products/sortsite/checks/accessibility-checks/