KNIME – Professional Open-Source Software is another effort by domain bridging folks I mentioned yesterday.
From the homepage:
KNIME (Konstanz Information Miner) is a user-friendly and comprehensive Open-Source data integration, processing, analysis, and exploration platform. From day one, KNIME has been developed using rigorous software engineering practices and is currently being used actively by over 6.000 professionals all over the world, both in industry and academia.
Read the KNIME features page for a very long list of potentially useful subject identity tests.
There is a place for string matching IRIs, but there is a world of subject identity beyond that as well.