Another acquisition from JBoss. Have a look at the official press release (pdf).

JBoss®, Inc., the Professional Open Source company, today announced it has acquired distributed transaction monitor and web services technologies owned by Arjuna Technologies and HP and will open source them for the JBoss Enterprise Middleware Suite (JEMS). In one strategic move, JBoss has propelled JEMS further into the high-end market long presided over by proprietary application platforms, while at the same time making pricey, enterprise-quality middleware software freely available to the mass market.

The acquisition includes Arjuna Transaction Service Suite (ArjunaTS), one of the most advanced and widely deployed transaction engines in the world with a 20-year pedigree, and Arjuna’s Web Services Transaction implementation, the market’s only implementation supporting both leading web services specifications Web Services Transaction (WS-TX) and Web Services Composite Application Framework (WS-CAF). This implementation is also one of the few that has demonstrated interoperability with other industry leaders such as Microsoft and IBM. The core Arjuna transaction engine will be the foundation of JBoss Enterprise Service Bus (ESB).