IBM's DB2 as a triplestore
Surprisingly easy to set up and use, but requiring lots of Java coding for any real application development.
I thought it was pretty big news for the semantic web world when IBM announced that release 10.1 of their venerable DB2 database manager could function as an RDF triplestore, but it seems that few others—not even, apparently, IBM staff responsible for marketing semantic technology—agreed with me. More on this below.
