Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
FLAC - A free, open source codec for lossless audio compression and decompression
YakYak - Desktop client for Google Hangouts
Opus Interactive Audio Codec - Opus is a totally open, royalty-free, highly versatile audio codec.
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
Vorbis - Ogg Vorbis is a fully open, general-purpose compressed audio format for mid to high quality...