This is an introduction to steganography, where a message is embedded into wave files. This is a command-line program for advanced users. This is a simple program for displaying the microphone input in real time. Easy, simple and quiet way to test your sound card. Very pretty colors.
Kids love it.
Spectrogram' by Richard Horne. This is the best program I've ever seen to display a sound. It has a meduim learning curve, but if you enjoy working with sounds, this is a must-have. The author is a dedicated freeware author who updates regularly. Prevar10.zip Prevaricator v1.0 is a combination Voice Stress Analyzer and WAV file media player which performs realtime frequency spectral analysis on the playback of audio data.