Andrew Sutherland has announced some tools he's been building on top of the Chronicle engine. They look cool! Even better, he's got some patches to Chronicle that fix some bugs and add a couple of significant new features to the query engine. I plan to integrate those patches soon, and I'll be using the features in my debugger very soon. Yay open source!
It's neat to see that he's using the engine from Python --- that's one of the possibilities I had in mind when I decided to make the engine export a JSON interface.