There are a number of commercial products based on Red Hat Enterprise Linux (RHEL). Information about these products and the version of RHEL they are based on is often difficult to come by, since this fact is not widely publicised.
Autodesk's Smoke, Flame and Lustre software all run on HP z800 machines pre-configured with a custom RHEL 5 distribution. An additional software package called the 'Discreet Kernel Unit' or DKU is added for additional proprietary device drivers and resources.
Thales Computers is embedding Red Hat Enterprise Linux 4 and 5 with its boards products, small and HPC turn-key computers
Trend Micro Interscan Messaging Security Virtual Appliance 7.0 is based on CentOS 5.0 (a re-compilation of Red Hat Enterprise Linux 5.0)
VMware ESX Server is VMware's enterprise-class virtualization platform. It contains two parts: the VMkernel, a proprietary hypervisor, and a Service Console, which supports various management interfaces. The Service Console is also known as the Console Operating System (COS). The Service Console is based on following Red Hat products: