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

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

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.

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

Automated accessibility testing tool for web applications.

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

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

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.

Accessibile color generator

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

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

Commands to help with Cypress-Axe

It uses the accessibility interface which handles UI and design related adjustments. All in One Accessibility app enhances your Aimeos website accessibility to people with hearing or vision impairments, motor impaired, color blind, dyslexia, cognitive & learning impairments, seizure and epileptic, and ADHD problems.

Checklist: Section 508 procedures and remediation advice in one interactive page

Unobtrusive Accessibility Checker for Summernote WYSIWYG that uses CSS

Run an Easally accessibility check programmatically.