I recently needed to do a quick audit on all my Ansible roles, and the easiest way (since almost every one is on GitHub, and that's the main source of truth I use) was to grab a list of all my GitHub repositories. However, it can be a little tricky if you have hundreds of repos. I'm guessing most people don't have this problem, but whether you do or not, the easiest way to get all of any given user's repositories using the GitHub v3 API is to run the following command:
curl "https://api.github.com/users/geerlingguy/repos?per_page=100&page=1" | jq -r '. | .name'