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Beowulf
opensource parallel computing from NASA.
http://www.beowulf.org/
Beowulf Underground
archive of the news sources dedicated to the beowulf community.
http://beowulf-underground.org/
Tina
self-made super-computer built out of commodity hardware components, running Linux, at the Institute of Theoretical Physics, Magdeburg.
http://tina.nat.uni-magdeburg.de/