wtf is a program you start with a set of directory names. It walks the tree(s) you specify in parallel and serves a simple query box at localhost:8086. You can type in the name of a file and it will pop up all instances of that file name in the tree. I wrote this in response to a problem we had. It is based on an example from the Go tutorials.

It is pretty rough at present but functionality is pretty good, I use it.