Dedicated platform to send and receive messages within your applications. It has simple REST API and clean web UI. It allows to control access to your queues with managed access tokens.
Cost / License
- Free
- Proprietary
Platforms
- Online


Apache Pulsar is described as 'Distributed, open source pub-sub messaging and streaming platform for real-time workloads, managing hundreds of billions of events per day' and is an app. There are more than 10 alternatives to Apache Pulsar for a variety of platforms, including Linux, Windows, Mac, Web-based and SaaS apps. The best Apache Pulsar alternative is Intent Bus, which is both free and Open Source. Other great apps like Apache Pulsar are RabbitMQ, Zenaton, Amazon Simple Queue Service and Eclipse Mosquitto.
Dedicated platform to send and receive messages within your applications. It has simple REST API and clean web UI. It allows to control access to your queues with managed access tokens.


Celery is an asynchronous task queue/job queue based on distributed message passing. It is focused on real-time operation, but supports scheduling as well.
Spooled is a high-performance, multi-tenant job queue system designed for reliability, observability, and horizontal scalability.

Zeplo lets developers add retry, delay, queue and schedule to HTTP endpoints without setting up Redis, RabbitMQ or SQS. Just prefix any HTTP endpoint with zeplo.to/ and the request is queued.




Pub/Sub works as a messaging middleware for traditional service integration or a simple communication medium for modern microservices.