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—The CELT codec has been merged into the IETF Opus codec and is now obsolete—

Software that uses or supports CELT

Applications

Ekiga
Ekiga is a VoIP and video conferencing application for GNOME
FreeSWITCH
FreeSWITCH is an open source telephony toolkit, ranging from softphone to softswitch
jack-audio-connection-kit (netjack)
JACK over a network
NexGenVoIP
A Next Generation Telephone System
RoarAudio
A network transparent sound server
Soundjack
Network Music Performance (MNP) client application

Frameworks/libraries

GStreamer
GStreamer is a library for constructing graphs of media-handling components
liboggz
Easy to use Ogg support library

Other uses

Radio CHNC
Studio link made by Jonathan Thibault from Navigue
—The CELT codec has been merged into the IETF Opus codec and is now obsolete—