There are 2 repositories under 508 topic.
Website for the United States Access Board, built on Federalist and USWDS.
Looking at all the different roles and functions needed to make (not build) an accessible website. And putting a spin on it.
Web-based escape the room style game developed for use by persons with disabilites
Here are quick solutions to get rid of some 508 compliance alerts.
An example of a solution to solve a 508 compliance issue of visual focus on the error page of a Ruby on Rails application.