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- Hedwig Hedwig is a publish-subscribe system designed to carry large amounts of data across the internet in a guaranteed-delivery fashion from those who produce it (publishers) to those who are interested in it (subscribers).
- Idium Portal - Idium Portal is a web-publishing system delivered by Norwegian company, Idium.
ZooKeeper is used for cluster messaging, service bootstrapping, and service coordination.
- Kafka Kafka is a distributed publish/subscribe messaging system
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