Lightning fast code searching made easy Etsy

They claim other search tools are, "too slow, too hard to configure, or require too much software to be installed."

Something like OpenGrok (http://opengrok.github.io/OpenGrok/) seems fairly straightforward and only requires a servlet container beyond Java; 1 more piece of software than Hound.

Seems cool, but also that they reinvented the wheel instead of improving an existing project.