Elementary my dear Jena
We've been thinking about Jena quite a bit lately with the move into Apache incubation. We can tell from all the emails we handle on Jena that it is used pretty heavily but we don't always get to hear about where it is being used.
Which made it fun to discover recently that IBM Watson, winner of the Jeopardy! challenge, uses Jena. There aren't many details, other than SPARQL being one of the search technologies used by Watson, but it is fun to see the various places that Jena pops up.