KWARC RDF Extractor, an extensible XSLT-based framework for extracting RDF from XML
The Krextor homepage, formerly at https://trac.kwarc.info/krextor/ (now broken), is currently being migrated to the wiki pages of this GitHub project (track progress at #1).
A part of the old homepage that has survived is an old list of publications mentioning Krextor: our own ones, plus third-party ones.