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Turn any program that uses STDIN/STDOUT into a WebSocket server. Like inetd, but for WebSockets.
Fluentd: Unified Logging Layer (project under CNCF)
Highly scalable realtime framework
ZeroMQ core engine in C++, implements ZMTP/3.0
A micro library providing Ruby objects with Publish-Subscribe capabilities
EMQ - Erlang MQTT Broker
A Microservice Toolkit from The New York Times
Google Cloud Client Library for Node.js
A distributed MQTT message broker based on Erlang/OTP
Pusher server implementation compatible with Pusher client libraries.
Tiny 200b functional event emitter / pubsub.