[http://code.google.com/p/resolveref ResolveRef] uses human-readable URLs which resemble minimal journal citations to redirect users to the requested full text journal article. It is written using the Google App Engine framework, and there is a version of running at http://resolveref.appspot.com . ...

Citation bot is a tool to expand and format references at Wikipedia, the free encyclopaedia. It retrieves citation data from a variety of sources including CrossRef (DOI), PMID, PMC and JSTOR, and returns the full metadata of a citation.

China DOI host by Web and Software Research Center of Tsinghua University

Troia is a set of graphical and command line tools for automating university interlibrary loan requests from various reference sources (BibTeX, RIS, DOI lookups, etc..) as well as perform some known fixes on glitched reference data from various sources.