I participated this last year and received a nice t-shirt.
To get a free shirt you need to make 4 pull requests on Github. This comment from a previous years post should still work - https://www.ozbargain.com.au/node/217465#comment-3159373
- Pull requests can be made in any GitHub-hosted repositories. As long as the project is public and GitHub-hosted, your PRs will count towards your participation.
- You can sign up anytime between October 1 and October 31. Just be sure to sign up on the official Hacktoberfest website for your PRs to count.
- Check your progress. Once you sign up on October 1, start checking how many PRs you’ve made via the checker on the Hacktoberfest site (make sure you're signed in first).
Does Pornhub count, I'd have an entire wardrobe by now with all the pull requests I've made.