Great resource to understand the diferent  virtualization systems and products. Nice point to start.

Free  Virtualization, eBook
Rank: 1668
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Start experiencing the benefits of virtualization with VMware Server, a robust yet easy to use product for users new to server virtualization technology. Add centralized management to your VMware Server environment with VMware VirtualCenter for VMware Server. You can also purchase Support and Subscription for VMware Server.

Propietary Free  
Rank: 338 11
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The Microsoft virtualization software that can be downloaded and used free. Only works on Windows systems.
Propietary Free  
Rank: 1370
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OpenVZ is an Operating System-level server virtualization solution, built on Linux. OpenVZ creates isolated, secure virtual environments — VEs (otherwise known as virtual private servers, or VPSs) on a single physical server enabling better server utilization and ensuring that applications do not conflict. Each VE performs and executes exactly like a stand-alone server; VEs can be rebooted independently and have root access, users, IP addresses, memory, processes, files, applications, system libraries and configuration files. See Documentation » Technology for more information.
Opensource  Linux, Virtualization
Rank: 1337
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Parallels Desktop for Mac enables you to run Windows, Linux, and more side-by-side with Mac OS X on any Intel-powered Mac, without rebooting. With Parallels’ award-winning virtualization technology, you can run Mac OS X and your favorite Windows applications at the same time. You can even drag-and-drop files between desktops!
Pay  Virtualization
Rank: 85
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Run multiple operating systems, including Windows, Linux, and Solaris, on your Macintosh at the same time as Mac OS X – without rebooting. Designed from the ground up for the Mac, VMware Fusion allows you to run Mac and Windows applications side-by-side – quickly and effortlessly sharing information between the two operating systems’ environments.
Pay  Virtualization
Rank: 1345
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innotek VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL).
GNU  Virtualization
Rank: 1393
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The QEMU manager provides quick control of the brilliant QEMU Emulator for Mac.  It provides media management, virtual machine management, easy storage of your media to iso or floppy disk image files for quick boot with QEMU, and provides basic process management should your QEMU session become unstable.

Free  Virtualization
Rank: 1340 1
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Seamlessly run Windows, Linux and other PC operating systems on your Intel-based Mac.
Pay  Virtualization
Rank: 238
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XenExpress v4 is a free, production-ready virtualization platform that enables everyone to quickly get started with Xen virtualization. Easily installed and seamlessly upgradeable, XenExpress is your on-ramp to Xen and the XenSource v4 product family.

Free  Virtualization
Rank: 1388
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Oracle VM is server virtualization software that fully supports both Oracle and non-Oracle applications, and is three times more efficient than other server virtualization products. Backed by Oracle's world-class support organization, customers now have a single point of enterprise-class support for their entire virtualization environments, including the Linux operating system, Oracle Database, Fusion Middleware, and Application software. It's free to use and you can pay for the support.

Free  Oracle, Virtualization, VM
Rank: 1697
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arallels Virtuozzo Containers is the world's leading OS virtualization solution. Parallels Virtuozzo creates isolated containers on a single physical server and OS instance. Compared to other virtualization technologies, Parallels Virtuozzo offers the highest levels of density, performance and manageability.

Based on OpenVZ but commercial version.

Pay  Virtualization, Parallels
Rank: 1779
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Server Virtualization, Virtual Server, Virtual Infrastructure

Pay  Virtualization, Server
Rank: 1745
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Free  Virtualization, Wikipedia
Rank: 1673
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Linux-VServer provides virtualization for GNU/Linux systems. This is accomplished by kernel level isolation. It allows to run multiple virtual units at once. Those units are sufficiently isolated to guarantee the required security, but utilize available resources efficiently, as they run on the same kernel.

GNU  Linux, Virtualization
Rank: 1702
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True sever virtualization for everyone

Pay  Blogs, Virtualization
Rank: 1646
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