My plan is to query several public data sources [from within a web worker on the client, to avoid restrictions], such as WikiData, ISBN DB, the Library of Congress API, GoodReads, and a few others. There's really a lot of open data available; I want Colibri to automatically pull in metadata on books and authors, if possible.

I have prototyped a lot on this, but not published it yet. It works pretty well :)