SAFMQ: Store and Forward MessageQueue, message oriented middleware. Uses include Assured Async Messaging, SOA, Delayed/Batch, and Cluster/Grid Computing. The SAFMQ server provides cross platform communication among C++, PHP, Java, and .NET clients.
Chomoko is a simple, light-weight, intuitive message transferring library. Pure C++ (with sockets), Open Source (GPL), Performance-Oriented, Assured (Reliable), Once Delivery, Point-to-Point, Easy to Setup and Use, Simple, and Clean