The Exim open-source project is run entirely by volunteers. Some of them wish to make additional content available to the public in their own namespace within the Exim domain. All URLs in https://people.exim.org/ are even less official than our normal web-pages are. But it should, at least, be something relevant to Exim or email in general.
No index at this time. Exim folks with a public_html dir can ask to have it enabled and ask to be listed here.