A bookmarklet that simulates various types of users with disabilities. It is an education tool that will hopefully educate people about web accessibility.
Web Experience Toolkit (WET): Open source code library for building innovative websites that are accessible, usable, interoperable, mobile-friendly and multilingual. This collaborative open source project is led by the Government of Canada.
a collection of strictly WAI WCAG 2.0 and WAI ARIA conform web applications based on jQuery UI. Currently a lightbox app, live form-validation & sortable tables are ready to use. Released under MIT licence.
jQuery Plugin that generates a Tab Navigation from Markup that makes sense without Javascript. The generated Tabs are the only ones out there that work for Screenreader users without support for WAI ARIA.