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SQL Relay is a persistent database connection pooling, proxying and load balancing system for Unix and Linux.

UberMQ is a clean room implementation of the Java Message Service specification. JMS is a part of the Java 2 Enterprise Edition. We wrote UberMQ because many of the established JMS vendors have turned their back on the core tenets of distributed computing: fast and simple.

OpenJMS is an open source implementation of Sun Microsystems's Java Message Service API Specification

XmlBlaster is MOM (Message oriented Middleware) with a lot of features. XmlBlaster is a publish/subscribe and point to point 100% Java based MOM server (message-oriented middleware) which exchanges messages between publishers and subscribers. The message is described with XML-encoded meta information. Messages may contain everything, GIF images, Java objects, Python scripts, XML data, a word document, plain text - just anything.

openadaptor™ is a Java/XML-based software platform which allows for rapid business system integration with little or no custom programming. openadaptor™ can be loosely classified as EAI (Enterprise Application Integration) software. It is highly extensible and provides many ready-built interface components for JMS, LDAP, Mail, MQ Series, Oracle, Sybase and MSSQL Server as well as data exchange formats such as XML. New components are regularly added.

Mantaray is an Open Source serverless messaging fabric, based on peer-2-peer technology, 100% pure Java, supports JMS1.1 and 1.02, and integrates with WebLogic and WebSphere. It provides guaranteed message delivery, security, and supports transactions.