Some other pages on our site you may enjoy:
RTPITCH - Real-time Pitch Track Display
RTPITCH is a free program for displaying a real-time fundamental frequency track for a speech signal on Windows computers. 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.