Publish/Subscribe, Request/Reply Messaging API for Java.
Open-Source Framework for Distributed Constraint Optimization (DCOP)
OpenDDS is open source publish/subscribe middleware
Java5 mobile agents in peer2peer containers without stubs/skeletons.
The open source grid computing solution
Middleware for distributed applications
JCA compatible Resource Adapter for SAP
Networking framework for Java applications
Transparent Local and Remote Parallelization for Java
peer to peer social network
Messaging Library for the Processing environment