This checklist uses The Web Content Accessibility Guidelines (WCAG) as a reference point, which is a shared standard for web content accessibility for individuals, organizations, and governments.
Microsoft Inclusive Design Methodology
An amazing resource for anyone who wants to build more inclusive experiences for everyone.
WAVE Web Accessibility Evaluation Tools
WAVE is a free web accessibility evaluation tool that identifies ways to make a webpage more accessible to people with disabilities.
WhoCanUse - color checker
It's a tool that brings attention and understanding to how color contrast can affect different people with visual impairments.