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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. -
LinkedMarkMail
LinkedMarkMail is a simple Linked Data interface for accessing the MarkMail archives. -
prefix.cc
A community-curated collection of namespace prefix mappings for use in RDF applications. Features a lookup API and bulk download.