This is a work in progress:
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Hazelcast (http://hazelcast.org/) is a distributed in-memory data grid. It can be used as a cache or queuing mechanism across a cluster of JVMs. Hazelcast can be embedded in the JVM or can run as an external server. Hazelcast is open source (https://github.com/hazelcast/hazelcast) but the complete commercial version is closed source (http://hazelcast.com/products/hazelcast-enterprise/) and not very cheap. Installations running at very high scale (100k+ users, 10+ nodes) should probably read the Deployment Best Practices and consider paying for the enterprise version.
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