coturn
BSD-3-Clause TURN/STUN NAT-traversal relay (not an SFU)
Comms / Realtime · OSS/MIT · 14.5k
Reviewed 2026-09-11 · last push 2026-10-17 · repo checked 2026-10-19
What's Good
BSD-3-Clause-style (3-clause). coturn/coturn. Free open-source TURN and STUN server for VoIP/WebRTC media NAT traversal — REST auth, TLS/DTLS, Docker images on Docker Hub/GHCR/Quay. Homepage coturn.github.io; source github.com/coturn/coturn.
The Catch
Vs LiveKit / Janus (rooms/SFU products), Pion / PeerJS (WebRTC libs/signaling): coturn is the *relay*, not a room product and not a client SDK. You still open UDP/TCP ranges, set realm/secrets, and pay bandwidth on the box that relays. Distinct from mediasoup/LiveKit media routing.
Verdict
BSD-3-Clause TURN/STUN. Free forever relay software; the bill is ports, RAM, and egress.
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