Faut que je teste ça :
Who uses Ganglia?

Berkeley (the birthplace of ganglia)
Twitter
flickr
last.fm
OpenX
Monetate
San Diego Supercomputing Center (contributed great code to the project)
Massachusetts Institute of Technology (MIT)
National Aeronautics and Space Administration (NASA)
National Institutes of Health (NIH)
Reuters
Internet Archive
Industrial Light & Magic
Wikipedia (check it out!)
Virginia Tech (built the fastest supercomputer at any academic institution in the world using ganglia)
Etsy
Pandora
Dow Chemical
Motorola
Harvard
D.E. Shaw
Lucent
CERN
Cisco
Sun (thanks for recommending ganglia for Grid Infrastructure!)
HP
Microsoft
Dell (thanks for the hardware donation!)
Cray
Boeing
Lockheed-Martin
GE Global Research
Cadence Design Systems
nVidia
Duke University
Bank of America
Queensland University of Technology
Georgetown University
UOL.com
PriceGrabber.com
Ticket Master
Qinetiq
Cummins
freescale
Sandia National Laboratories
Rocketcalc
Yale
Deutsches Elektronen-Synchrotron
bp
Nortel
LexisNexis
Landmark
SARA
Bellsouth
University of Pisa, Italy
X-ISS
Tennesee Tech University
Princeton
The Moving Picture Company
University of Michigan
Universite De Sherbrook
The Royal Bank of Scotland
U.S. Air Force
Celgene
Groundwork
Brookhaven National Laboratory
N.E.C.
GlobeXplorer
John Deere
Xilinx
Freddie Mac
jeteye
Tokyo Institute of Technology
Purdue University
Stanford
and thousands of other people just ask Google.

http://www.google.com/search?q=link:http://ganglia.sourceforge.net/