"While Fluid Operations' Java-based driver is only in
the early stages, and is currently only read-only capable at this
point, this represents some of the very first significant efforts
by the independent Open Source community to provide
interoperability with VMWare's standards.
"VMWare itself has only had a few exploratory forays into Open
Source. In 2006 they opened their Virtual Machine Disk Format
(VMDK) which is used as the file container for all VMWare VMs.
About a year ago, the company released Open-VM-Tools, the
paravirtualization drivers for optimizing video, I/O, network and
mouse operations within a VMWare virtual machine. VMWare recently
announced VMWare View Open Client which enables Linux-based systems
to connect to remote desktops, VMWare has also released the
modifications to GPL/LGPL-licensed components used in their
products, but has fallen short of actually open sourcing their ESX
hypervisor, the crown jewel of the VMWare stack."