An RDFizer is a software or service for converting non-RDF data sources into one or more of the RDF (Resource Description Framework) data model serializations (such as RDF/XML or N3), often with some ontology matching or characterizations. RDFizers, also known as converters or "spongers", work in a similar way to ETL software or services.
RDFizers exist for most leading data formats and APIs. One of the largest listings, maintained by the OpenSemanticFramework.org Web site, lists over 150 variants. Key sources for RDFIzer converters include: