DTMF 

DTMF dial is a software program designed to emit DTMF tones (including A, B, C and D) from the PC sound card. It has push button, keyboard, clipboard paste and command line interface.
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Funny Voice 

Funny Voice changes the pitch of your voice. Higher pitch will let you sound like a smurf, less pitch will give you a deep voice. All you need is a microphone. The program is completely free! Great for your next karaoke party!
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3D MP3 Sound Recorder 

This sound recorder enables you to record sound, played back through your sound card, microphone ,line in and any other sources. It can be used to grab any sound, including music, dialogs from movies, game sounds etc. saved in WAV or MP3 format.
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