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The first alpha of JBoss Cache 3.0.0 - codenamed Naga - is out and available for download. In a nutshell, it is a truly open source (LGPL) distributed enterprise cache, which is often used as a library to remove data retrieval and calculation bottlenecks, or as a mechanism to share state across a cluster either for failover or load balancing, creating data grids, etc. I have also seen it used as a distributed in-memory object database of sorts, as a fast alternative to a more traditional database when typical DB features and guarantees aren't critical