• Written in Tcl/Tk (http://wiki.tcl.tk).
• Uses the wonderful Snack sound package (http://www.speech.kth.se/snack/).
• Distributed as a single file executable thanks to Jean-Claude Wippler's starkit technology for Tcl/Tk (http://www.equi4.com/tclkit)

If you are interested in looking at the Babbleback machine's sourcecode, then check out http://babbleback.sourceforge.net/cvs/babbleback.tcl.