NATS Alternatives

Realtime application framework (Node.JS server)

Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

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Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.

SignalR is a server-side software system designed for writing scalable Internet applications, notably web servers.

Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.

RabbitMQ is an open source message broker software.

Eclipse Mosquitto is an open source (EPL/EDL licensed) message broker that implements the MQTT protocol versions 5.0, 3.1.1 and 3.1. Mosquitto is lightweight and is suitable for use on all devices

PubNub is a real-time messaging system for web and mobile apps that can handle API for all platforms and push messages to any device anywhere in the world in a fraction of a second without having to worry about proxies, firewalls or mobile drop-offs.

Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.

open-source

Amazon Simple Queue Service is a fully managed message queuing service.

Apache ActiveMQ is an open source messaging and integration patterns server.

HiveMQ is the MQTT based messaging platform for fast, efficient and reliable data movement to and from connected IoT devices and enterprise systems

VerneMQ is an open source, high-performance, clusterable MQTT broker.