That would be the program by Jay Thomas. http://forum.shrapnelgames.com/showthread.php?t=35142
Its a .net program and installs rather strangely but it is nice.
He tried to add editing capability but said he ran into CRC protections that he would rather not bypass.
I tend to prefer CatGod because it lets me save the results to a text file.
Aha, so that's where it was from. But the program is no longer maintained, and even the published version could very easily crash in interesting ways because it assumed a few things that don't have to be that way. Your best hope is that JK will include this functionality into the game at some point.