Thomas Cort link checking suite is Node.js software to make the checking of links in documentation sites (and not only doc) easy and efficient. It can be used as a standalone or in a CI process. It's configurable and of course as an open source project, you can customise and participate by pushing Pull Requests. As one of the maintainers of this tool suite, I will provide an overview of the link checking process as well as a tour of the reasons why you should care about your links and a demo of how this specific tool works. The specific following points will be discussed: - Why you should check your doc links and why it matters from a freedom point of view. - How to use Markdown Link Check (demo) - What are your options to test with Markdown Link Check: run it locally on Node.js (demo), Docker, CI jobs (demo), Github Action... - How to get involved in Markdown Link Check project.