Open Source Development of (SmartGrid) Data Analysis Platform based on OpenPDC and Cloud Computing Technology. * Source Codes - http://nephee.sourceforge.net, Main Project (Info, Planning, News) , http://nephee.or.kr, http://twitter.com/nepheer
Cube Platform is a decentralized gridcomputing system that uses P2P Pastry protocol for communication between nodes. It's a big data storage written in Java.
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.