Wizard of Oz Tool (Freeware)
WOz comes with a GUI now!
Download Version 2.31 ZIP File
from May 16, 2009+ Get Tcl/Tk
see docs if you use 8.5
If that should not work, pls try this linkSpeech App Design Tool
Graphical frontend,
Undo/Redo,
VoiceXML export.
Latest Improvementspl-PL is a supported language now
New since Oct 2006: Online Documentation