I have just created a web page with some app inventor extensions.
You can access here: https://technologiescv.wixsite.com/technologies-cv/extensiones-app-inventor
But much more extensions are available on https://puravidaapps.com/extensions.php
Yes, and there are also extensions listed there that weren't even published.
E.g. this one from @Boban:
Anyway, you have done it
There are more than hundreds of extensions in the @Taifun extension directory and from the beginning. It will take a very lot of time to manually record all the extensions without copying.
I think that there are now more than 700 extensions.
In June 2020 there were already more than 625: