GitHub doesn't allow a user to follow an organization. As a result, users don't get to see the activity done by that particular organization.

I have tried creating a small solution (refer to the link) for the same, and it uses GitHub as a distribution channel.

- You need to create an issue (in the linked repository) with the link to that organization.

- If a new repository is created, the thread will be updated (every 12 hours) with the link to the new repository.

- Check the list of issues if the organization is already subscribed or not.