It's archived here https://web.archive.org/web/20210815171931/https://tex.loria.fr/prod-graph/z... which might suffice until the author gets his certificates sorted out?

On 22 May 2022, at 09:41, Jan-Erik Hägglöf via ntg-context wrote:

HI!

I have issues to access the very most useful place to get inspiration to write MetaFun code.

Google Chrome reports security issues

Maybe this could be off topic in this forum, if so, My apologize in advance. But maybe someone knows the author of this site

https://tex.loria.fr/prod-graph/zoonekynd/metapost/metapost.html

— Bruce Horrocks Hampshire, UK