Koillection is a self-hosted collection manager created to keep track of physical (mostly) collections of any kind like books, DVDs, stamps, games... As Koillection is meant to be used for any kind of collections, it doesn't support automatic download of metadata. But it offers the possibility to add your own metadata freely.
Requires PHP v8.1, Postgres or MySQL (but not MariaDB), node.js and yarn to assemble the webshit, and Composer to make PHP act like node.js.