Software
The software library libcelt serves as the reference implementation for CELT, written in C and published as free software under Xiph's own 3-clause BSD-ish license.
Despite the format not being finally frozen, it was being used in many VoIP applications such as Ekiga and FreeSWITCH, which switched to CELT upon entering soft-freeze in January 2009, as well as Mumble, TeamSpeak and other software. In April 2011, support for CELT was included in FFmpeg.
CELT is also supported or used by:
- Gablarski
- GStreamer
- jack-audio-connection-kit (netjack)
- liboggz
- Mumble (starting with version 1.2)
- NexGenVoIP
- Radio CHNC
- RoarAudio
- SFLphone
- Soundjack
- TeamSpeak 3
- SPICE
- Dota 2
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