Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
There's only one company that doesn't use Linux for its server virtualization platform. Can you guess which one it is? If you guessed Microsoft, you're correct. Microsoft is a newbie in the virtualization space but wants in and may make significant dents in the already well-established market that is significantly owned by VMware. For Windows-only virtualization, there may be some validity to the switch to Hyper-V.
For the rest of us, who are either too stubborn or too smart to make the shift to Hyper-V, what are our choices? The following is a list of 5 of the main players in Linux-based virtualization. The list is ordered in what I believe to be from most popular/best supported to the least in this area.
1. VMware - I know I give these guys a hard time but when they're so prominently displayed, they must stand up to a bit of criticism. With over 80% market share, VMware is a force to be reckoned with in the virtualization space.