LinkedIn has released Samza, a big data tool for real-time data processing, under an open source license. LinkedIn’s Chris Riccomini explained, "Samza helps you build applications that process feeds of messages—update databases, compute counts and other aggregations, transform messages, and a lot more."
The software is very similar to Twitter's Storm; however, Samza relies on LinkedIn's Kafka messaging system. In addition, Samza integrates with Hadoop. The project's documentation offers a list of similarities and differences between the two.
Samza is now an Apache incubator project.