1. Akka toolkit and runtime for building highly concurrent distributed and fault tolerant event-driven applications on the jvm. URL akka.io. Akka toolkit and runtime for building highly concurrent distributed and fault tolerant event-driven applications on the jvm. URL akka.io .
2. Ehcache a java distributed cache. URL ehcache.org. Ehcache a java distributed cache. URL ehcache.org .
3. Hazelcast a data distribution platform for java. URL www.hazelcast.com. Hazelcast a data distribution platform for java. URL www.hazelcast.com.
4. Kryo a jvm serialization library. URL code.google.com/p/kryo. Kryo a jvm serialization library. URL code.google.com/p/kryo .
5. ScalaSTM a software transactional memory api for scala. URL nbronson.github.com/scala-stm. ScalaSTM a software transactional memory api for scala. URL nbronson.github.com/scala-stm .