http://www.concoctedlogic.com/digfe/
From the homepage:
Digfe is a free, GUI interface or 'front end' for the dig program. Dig is a dns client, distributed with ‘bind’ – the named daemon for Linux / Un*x , NT/2000, VMS, AIX, and just about every other box on the planet.
Digfe is being written in Visual Tcl 1.6.0a1.