Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
FLAC - A free, open source codec for lossless audio compression and decompression
tSIP - tomeko.net/software: SIP client for Windows.
Opus Interactive Audio Codec - Opus is a totally open, royalty-free, highly versatile audio codec.
YakYak - Desktop client for Google Hangouts
Vorbis - Ogg Vorbis is a fully open, general-purpose compressed audio format for mid to high quality...