1. Amazon Elastic Compute Cloud, http://aws.amazon.com/ec2
2. The Folding@home project. Stanford University, http://www.stanford.edu/group/pandegroup/cosm/
3. Sun Utility Computing, http://www.sun.com/service/sungrid/index.jsp
4. The Great Internet Mersenne Prime Search, http://www.mersenne.org/
5. Anderson, D.P., Cobb, J., Korpela, E., Lebofsky, M., Werthimer, D.: SETI@Home: An experiment in public-resource computing. Communications of the ACM 45(11), 56–61 (2002)