Here is the link to the FSF directory of free software.

We can start with tools for Developer experience participant testing:

• vlc
• simplescreenrecorder
• Bourne-Again SHell
• https://directory.fsf.org/wiki/WordPress (possible clickmap/testing environment)
• https://directory.fsf.org/wiki/Drupal (alternate click heat map)
• https://directory.fsf.org/wiki/Sphinx
• https://directory.fsf.org/wiki/Jekyll (not used - Contrib cov adopter)
• https://directory.fsf.org/wiki/Markdown
• other