C.H.A.O.S. is a Linux distro made for clusters.
Cross-platform grid computing solution
TuCSoN tuple-based coordination middleware
TaskManager manages calculation jobs in a computer cluster environment
Batch system monitoring and archiving
Transparent Local and Remote Parallelization for Java
Actor based programming using WCF and async-await.
A CORBA TradingService
Kepler is a monitoring system for HPC clusters