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Loki: Los Alamos National Laboratory,
 http://loki-www.lanl.gov/index.html
Hyglac and Naegling: Center for Advanced Computing Research,
California Institute of Technology,
 http://www.cacr.caltech.edu/research/beowulf/
The Warren-Salmon Treecode:
 http://qso.lanl.gov/papers/Papers.html
Grendel: Department of Electrical and Computer Engineering,
Clemson University,
 http://ece.clemson.edu/parl/grendel.htm
Hrothgar: Drexel University,
 http://einstein.drexel.edu/beowulf/Beowulf.html