[bornagainpenguin]

Artwork Downloader?

No, the addon I'm thinking of had been abandoned (but still working on github) and had an explicit option to take all the artwork from the artwork downloader addon and integrate it into the library, so if your skin didn't see it at first, now it would after you ran the other addon.

Milhouses texture tool?

I can't seem to find anything different, but from what I do read it seems that is an external tool, run from the command line. The script I'm remembering ran from within Kodi. (Or does Milhouse's texture tool run within Kodi also and the command line usage is either optional/extended explanation of how it works?)