Am I in The Stack? - a Hugging Face Space by bigcode
huggingface.co
This tool lets you see whether repositories under a given GitHub username are part of The Stack, a large open‑source code dataset. Just enter the username (or repository name) and the app tells you...

Hugging Face crawls as many GitHub repositories as it can with the help of the Software Heritage Archive so as to create their Stack v2 LLM for code. And of course without consent of rights holders.

Opt-out is possible.