Quoting Marek 'marx' Grac <mgrac redhat com>:
Hi, I know that there is no support for VMWare ESX yet but I would like to know if someone is working on it. I need just three basic operations: status/power on/power off but I never saw the source code of libvirt :) Do you think it is possible to write this support (using VMWare API) in acceptable time? week? month?
A couple of months ago someone said he was going to write VMWare support but no word since then. Here is the thread:
http://thread.gmane.org/gmane.comp.emulators.libvirt/4747 -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer)