RDF2RDB – convert RDF data to relational databases
RDF2RDB is a free tool written for Python 2 to convert RDF data from the Semantic Web to relational databases. It supports incremental runs (adding more RDF data to a database later) and entailment of new data.
The tool only holds schema data in memory and should support big amounts of data – although performance may be slow.
Find the current version on GitHub