Most open-source virtualization titles are free. Installation and modifications are done either by a consultant or a dedicated programming resource. Many open-source solutions are extremely easy to install, while others require some technical expertise for proper deployment. File formats are compatible with branded software solutions.
For businesses looking to go open source with virtualization, there are a wide variety of provider options:
Virtualizing at the operating system level, the OpenVZ architecture is based on Linux Kernel and Linux operating system. Relatively inexpensive and surprisingly flexible, OpenVZ allows for the addition of resources in real time without requiring a reboot.