Hmm, I don’t think there’s a wiki page (anyone know of one?)
I have added it to the list on this wiki page, for now:
https://wiki.musicbrainz.org/External_Resources
I have already wondered about making a separate Picard scripts/tools (that aren’t suited to be added to the more ‘official’ Picard website) Wiki page, this will probably nudge me to finally make one - when I have time 
If anyone wants to beat me to it, go for it!
edit: made the wiki page (thread)