Ehcache is an open source, standards-based cache for boosting performance, offloading your database, and simplifying
scalability. It's the most widely-used Java-based cache because it's robust, proven, and full-featured. Ehcache scales from in-process, with one or more nodes, all the way to mixed in-process/out-of-process configurations
with terabyte-sized caches.
Terracotta actively develops, maintains, and supports Ehcache as a professional open source project available under an Apache 2 license. In addition to the open source Ehcache edition, Terracotta offers BigMemory for enterprise-grade in-memory data management with high availability, worldwide 24x7 professional support, consulting, and training services.
For applications requiring a coherent distributed cache as well as in-memory performance, use Terracotta BigMemory Max which is available in both extended trial and full versions. (Terracotta no longer actively updates the open-source version of Terracotta Server Array, also known as Terracotta.)