IBM Equal Access Accessibility Checker contains tools to automate accessibility checking from a browser or in a continuous development/build environment

Sa11y is an accessibility quality assurance tool that visually highlights common accessibility and usability issues. Geared towards content authors, Sa11y straightforwardly identifies errors or warnings at the source with a simple tooltip on how to fix them.

AET - a system that detects visual changes on web sites and performs basic page health checks

An accessibility checker tool for validating the color contrast based on WCAG 2.0 and WCAG 2.1 standards.

PUXL framework is a free and open-source and eco-friendly library to create front-end Web interfaces. It helps you build accessible and responsive sites with lightweight HTML.

Browser extension that encourages accessibility awareness while using GitHub

A Discord Bot that publicly "shames" those who forget to add alt text to their images. In a friendly way, of course.

Checks the color contrast of your color design based on Web Content Accessibility Guidelines (WCAG)

The open source accessibility playbook is a resource for repo maintainers and contributors, consumers and end users of open source projects. Let’s create a future where all open source projects are inclusive and accessible to everyone.

Apple framework for calculating color contrast ratios, WCAG conformance, and high contrast color values (UIColor & NSColor).

simplA11yMonit is a tool supporting the simplified accessibility monitoring method in Luxembourg.

Automated accessibility testing tool for web applications.

💀 Skeletonic CSS - A lightweight, intuitive, accessible and ultra-responsive CSS Framework to streamline your Digital and Mobile Web development needs.

Unobtrusive Accessibility Checker for Summernote WYSIWYG that uses CSS

Accessibile color generator

CSS HTML Validator is a fast HTML and CSS validator / syntax checker / linter that can also check accessibility, SEO, and more. This project is another way to report issues and feature requests.

Lumberjack is a set of accessibility tools designed to make socializing current issues simple and motivational.

ACE Plugin for calibre

Accessibility Notifier App. Checks the accessibility of given websites.

A web accessibility run book is a document that provides guidance and instructions on how to ensure that a website or web application is accessible to people with disabilities.