The Open1451 Project provides a repository for implementations, examples, and applications of the IEEE 1451 Standard for a Smart Transducer Interface for Sensors and Actuators.
JCGrid is an easy-to-use tools for real-world grid-computing. It requires only to install Java Runtime and you can easy split your cpu-intensive task among several Workstations/PC/Mac/etc. It includes support for POVRay and MandelGrid as usage examples.
Some example exercises about distributed systems in computer science. Some code examples for Java RMI, Java Server Socket and Peer to Peer Systems written in Java. Probably using the Hibernate framework and some other Java Technologies.