CentrifugoDeliver realtime messages to application clients over WebSockets or server-sent events.
100% free open-source (Apache-2.0). Unlimited connections and message throughput.
Realtime pub/sub messaging & live WebSockets infrastructure
Free alternatives to PubNub
Find a free app for the parts of PubNub you actually use.
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Free options
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SoketiSend realtime application events through a Pusher-compatible WebSocket server.
100% free open-source (Apache-2.0). Unlimited concurrent connections.