Recently, OStatic covered
Eucalyptus, an open source infrastructure for cloud computing on clusters that duplicates the functionality of Amazon's EC2, using the Amazon command-line tools directly. We've also been covering several
interesting projects focused on cloud computing. Rich Wolski, who directs the Eucalyptus project at U.C. Santa Barbara, is an expert on grid computing, and was kind enough to share with me some of the other open source projects he finds notable in this space.