LIMO
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I had in mind to write something much like this after I did something similar (but much simpler) at work. My idea was to implement a simple servlet that had many of the features of LUKE, the Lucene Index Toolbox. LUKE allows you to browse your index like LIMO, but also allows you to execute searches and browse the results. Now I think it would be fun project to add query functionality to LIMO.
Maybe after the election.