Docuwiki (not to be confused with DokuWiki) is still the most thorough source I've seen for niche documentaries.
https://docuwiki.net/index.php?title=Category:Name
It is all ed2k links. Unfortunately modern clients for ed2k are quite lacking
https://docuwiki.net/index.php?title=Category:Name
It is all ed2k links. Unfortunately modern clients for ed2k are quite lacking