Google Cloud Messaging Alternatives

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.

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

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ZeroMQ is a high-performance asynchronous messaging library.

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OCS inventory NG is a free software that enables users to inventory IT assets.

Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably send messages at no cost.

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

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A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.

CloudMQTT implements MQ Telemetry Transport protocol for carrying out messaging using a publish/subscribe message queueing model.

Gearman provides a generic application framework to farm out work to other machines or processes that are better suited to do the work.