"The Leading Open Source In-Memory Data Grid"
Ranked in these QuestionsQuestion Ranking
Pro Open source
Hazelcast is a free and open source software released under the Apache 2 license.
Pro Cross platform clients
Pro Good documentation
Hazelcast's documentation is excellent, they have a full javadoc and very in-depth guides for performance tuning and all the bells and whistles of the framework.
Pro 24/7 professional support available
Hazelcast has 24/7 professional support available for open source users.