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Quantitative System Performance
http://www.cs.washington.edu/homes/lazowska/qsp/ -
Stratton & English Software - Performance Specialists
http://www.strattonenglish.co.uk -
ATL-CSIM: System Simulation and Modeling Tools.
http://www.atl.external.lmco.com/projects/csim/ -
Speed Up PC Performance
http://www.speedupnow.com/