Cfengine has thousands of registered users.
Many of its users wish to remain anonymous, but we can share some of them below,
with their permission or from media sources. These users have deployments that span tens to tens of thousands of hosts.

Alcatel-Lucent AT&T ATCO American Micro Devices (AMD) Banco BBVA Bloomberg Caltech Chevron Cisco Systems CSC Disney Imagemovers eBay Ernst & Young Fermi National Accelerator Laboratory Gentoo Linux Google Hi5 Networks IBM Ironport Juniper Networks Karlsruhe Institute of Technolog Looksmart Ltd Mnemonic AS Napster NOAA/OAR/ESRL/GMD/IT Nokia Oregon State University, Open Source Lab PayPal Pixar PopCap Games Qualcomm Ripe NCC SARA NL Skolelinux - linux for schools Snapfish Stanford University Swisscom Tufts University Umbria, Inc Virgin Radio 0x1b, Inc. Yale University Zinnia Internet Products Inc