1)   Harmonix 1.1
With the Harmonix PhotoShop plug-in you can draw complex wave lines build by mixing harmonic frequencies. Useful for quickly generating oscilloscope or heartmonitor display, graphs or to play around with the concepts of harmonic frequency mixing.

 2)   MP3 Surgeon 2003 Lite
A Visual MP3 editor which allows users to trim, join and split any number of MP3s to varying lengths and sizes, apply fade in/out effects, normalise their entire collection to the same volume level - and much much more besides.

 3)   Wave Flow 5.4
Wave Flow is a powerful shareware audio editor with more than 60 sound edition functions and interesting effects (edition, tools, filters, etc). It has a visual interface that makes it very easy to use.

 4)   Tone Generator 2.10
NCH Sound Tone Generator lets you create audio tones, sweeps or noise waveforms using a Windows computer with a sound card.