Web applications

Dynamic Assessment Plugin
Quickly scans web applications to identify accessibility issues and recommends corrections to violations.

Automated A11y Tester
Detects and remediates accessibility issues during agile development and testing.

Digital Content Checker
Inspects and verifies the accessibility of HTML content and EPUB documents.
Open source accessibility

Desktop accessibility: AccProbe
Combines numerous accessibility inspection and event management tools to test rich client applications.

Repository of best practices: Va11yS
Working accessibility code samples and design patterns that can be used to speed development efforts.
Resources

Accessibility checklists
Set of guidelines to help create accessible web, mobile and desktop applications for people of all abilities.

Inclusive design
Design principles to help you better understand how physical and cognitive disabilities affect the use of a product.