Bibliographica

"The Bibliographica service is an open catalogue of cultural works. It grew out of the Public Domain Works project which started in 2005 and is still running today. The Bibliographica software that powers this site is open-source and designed for others to use. Moreover, different bibliographica instances can co-operatively share information. Other significant features include native RDF support, FRBR-like domain model, and wiki-like recording of every change"