Linux-VServer

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.

This site contains information relating to the use and development of virtual servers based on Linux-VServer. This particular virtual server model is implemented through a combination of "security contexts", segmented routing, chroot, extended quotas and some other standard tools.

Download:- http://linux-vserver.org/Downloads

Xen Virtualization

The Xen® hypervisor, the powerful open source industry standard for virtualization, offers a powerful, efficient, and secure feature set for virtualization of x86, x86_64, IA64, ARM, and other CPU architectures. It supports a wide range of guest operating systems including Windows®, Linux®, Solaris®, and various versions of the BSD operating systems.

Xen Community Deliverables

The open source Xen community currently delivers several solutions for use by customers, software and hardware vendors, researchers, developers, hobbyists, etc.

• Xen Hypervisor - Leading open source hypervisor for servers Learn More
• Xen Cloud Platform - Enteprise cloud solution stack for virtualization Learn More
• XCI - Xen hypervisor for client devices Learn More
• Xen.org Projects
• HXEN - Xen running as a Type 2 hypervisor Learn More
• Xen ARM - Port of Xen hypervisor to ARM processor Learn More
• Project Satori - Support for paravirtualized Xen Linux guests running on Hyper-V Learn More

The Xen.org community also supports a variety of solutions built for and around the Xen Hypervisor. Click here for a list of those projects.

Product Download:-

• Xen Hypervisor 4.0.1 Download
• XCI 1.0 Download
• Xen Cloud Platform 1.0 beta Download (Info)
• Community Projects
• HXEN 1.0 Download
• Xen ARM Download
• Project Satori Download

KVM (Kernel Based Virtual Machine)

KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. KVM also requires a modified QEMU although work is underway to get the required changes upstream.

Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.

The kernel component of KVM is included in mainline Linux, as of 2.6.20.

KVM is open source software.

Download link:-  http://www.linux-kvm.org/page/Downloads

http://sourceforge.net/project/showfiles.php?group_id=180599.

VirtualBOX

VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product 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). See "About VirtualBox" for an introduction.
Presently, VirtualBox runs on Windows, Linux, Macintosh and OpenSolaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7), DOS/Windows 3.x, Linux (2.4 and 2.6), Solaris and OpenSolaris, and OpenBSD.
VirtualBox is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while Oracle ensures the product always meets professional quality criteria.

VMWARE PLAYER

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Vmware Player

A virtual machine is a computer defined in software. It's like running a PC on your PC.
This free desktop virtualization software application makes it easy to operate any virtual machine created by VMware Workstation, VMware Fusion, VMware Server or VMware ESX, as well as Microsoft Virtual Server virtual machines or Microsoft Virtual PC virtual machines.

• Run multiple operating systems simultaneously on a single PC
• Experience the benefits of preconfigured products without any installation or configuration hassles
• Share data between host computer and virtual machine
• Run 32- and 64-bit virtual machines
• Leverage 2-way Virtual SMP
• Use 3rd-party virtual machines and images
• Share data between host computer and virtual machine
• Broad host and guest operating system support
• Support for USB 2.0 devices
• Get appliance info at start-up
• Gain easy access to virtual machines via intuitive home page interface