FreeDV

FreeDV screenshots

It allows any SSB radio to be used for low bit rate digital voice
Main window
FreeDV 0.9 beta : Main window

Alternative downloads

AthTek Voice Recorder
Free AthTek Voice Recorder - voice recording, Mp3 playing and sound repeating.
2.0
FREE
Free Voice Changer
It is a program that can change the voice pitch of an audio file.
1.0
FREE
GritTec's Noise Cancellation
Allows you to reduce the external hindrances and background noises in a speech.
2.10