{"data":{"slug":"mosquitto","name":"Eclipse Mosquitto","tagline":"EPL-2.0 / BSD-3 MQTT broker; OSS self-host forever free","category":"comms","categoryName":"Comms","url":"https://mosquitto.org","github":"https://github.com/eclipse-mosquitto/mosquitto","pricing":"open-source","hook":"Mosquitto is the MQTT broker you run when NATS subjects are the wrong protocol.","whatsGood":"EPL-2.0 OR BSD-3-Clause (EDL-1.0; LICENSE.txt SPDX). OSS self-host forever free. Lightweight MQTT broker. Cedalo Pro is optional commercial — not required for the free path.","theCatch":"MQTT broker, not a NATS messaging fabric. Distinct from Soketi/Laravel Reverb/Centrifugo (WebSocket/Pusher paths). Not a messaging-bus twin of NATS. Cedalo Pro exists; do not invent rates.","verdict":"Eclipse MQTT broker. Self-host free forever. Not NATS, not Soketi.","addedAt":"2026-09-04","featured":false,"domain":"Comms","subSpecialty":"Realtime","capabilities":["mqtt","broker"],"surfaces":["Self-host"],"ecosystem":["Multi-platform"],"licenseModel":"OSS/MIT","githubStars":11179},"related":[{"slug":"livekit","name":"LiveKit","tagline":"Apache-2.0 realtime rooms, SFU, and agents"},{"slug":"chatwoot","name":"Chatwoot","tagline":"MIT-core support inbox you can self-host for $0/agent"},{"slug":"socket-io","name":"Socket.IO","tagline":"MIT realtime library with fallbacks, not a hosted product"},{"slug":"plunk","name":"Plunk","tagline":"AGPL-3.0 transactional email, workflows, and broadcasts"},{"slug":"centrifugo","name":"Centrifugo","tagline":"Apache-2.0 Go realtime server binary, not in-process Socket.IO"}],"links":{"self":"/api/gems/mosquitto","html":"/gems/mosquitto","markdown":"/gems/mosquitto.md","category":"/api/gems?category=comms","categoryPage":"/stacks/comms"}}