VoiceChatter is a free, open source, and cross platform voice chat application. It is built for gaming, so it is light weight, yet delivers excellent voice quality over minimal bandwidth and latency. For more, visit http://www.voicechatter.net
Digital Speech Decoder and xMBE codec library - To decode various xMBE based, QPSK, C4FM modes such as P25 Phase 2 (TDMA), MotoTRBO, ProVoice, NexEDGE and others..
A patent-free audio codec designed especially for voice (unlike Vorbis which targets general audio) signals and providing good narrowband and wideband quality. This project is complementary to the Ogg Vorbis codec.