Some people may have heard of the Talis-sponsored Juice project. It is a pretty cool software.
Umlaut actually approaches the same problem space as Juice, in a similar way (along with doing a lot more).
Through Umlaut, I am currently including in my catalog:
- Google Books fulltext, search, and limited preview
- Amazon search and limited preview
- OpenLibrary fulltext
- HathiLibrary fulltext and limited preview
- Links to Ulrichs; Worldcat Identities; (coming soon) Journal Citation Reports
Entered from the link resolver end, with article-level metadata, Umlaut also provides ISI and Scopus “cited by” and other links (coming soon). And some other stuff.
Umlaut’s definitely a heavier-weight piece of software, more of a commitment. But it does cover the same basic use scenario as Juice, plus a lot more.
You could theoretically use Umlaut without a <strikeout>link resolver</strikeout> traditional journal-based link resolver knowledge base to just provide title-level services like Juice does.