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Debian Package Tracking System
Data on all Debian packages is available as RDF via content negotiation from the Debian QA website. This uses the ADMS.SW standard. More background in this blog post. -
BibSonomy - A blue social bookmark and publication sharing system
Description From front page: BibSonomy is a system for sharing bookmarks and lists of literature. When discovering a bookmark or a publication on the web, you can store it on... -
prefix.cc
A community-curated collection of namespace prefix mappings for use in RDF applications. Features a lookup API and bulk download.