A new version of Cloudmin GPL is now available, for managing KVM instances on a single host system. This lets you try out the Cloudmin UI in a limited environment before purchasing the full version, which can manage KVM instances spread across multiple host systems.
The new installer can be downloaded from http://www.virtualmin.com/documentation/cloudmin/gpl
It can be run on CentOS, Fedora, Debian and Ubuntu systems, as long as they have a CPU with Intel VT-x or AMD-V support. The install process automatically sets up the required network bridge and DNS zone for use by virtual machines.