Some other pages on our site you may enjoy:
PROREC - Speech Prompt & Record System
Prorec is a free Windows PC program for prompting speakers with lists of words or sentences and recording their speech back to disk. More information.
ESYSTEM - Signals and Systems teaching tool
ESYSTEM is a free program for experimenting with signals and systems. With ESYSTEM you can see the effect of simple systems on a range of simple signals. More information.