VirtualBox

VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use.

Free Open Source Windows Linux BSD Mac Solaris

VMware Workstation Pro

VMware Workstation Pro is a commercial hypervisor that allows users to create and run virtual machines on one computer.

Commercial

VMware Workstation Player

VMware Workstation Player builds on the industry leading foundation of Workstation Pro, and delivers a streamlined user interface for creating and running operating systems and applications in a virtual machine.

Free Personal Windows Linux

QEMU

QEMU (short for "Quick EMUlator") is a free and open-source hosted hypervisor that performs hardware virtualization.

Free Open Source Mac OS X Windows Linux BSD

Parallels Desktop

Parallels Desktop gives Mac users the ability to run Windows, Linux or any other operating system and their critical applications at the same time as Mac OS X on any Intel-powered Mac Pro, iMac, Mac Mini, MacBook or MacBook Pro.

Commercial

VMware Fusion

Seamlessly run your favorite Windows applications and devices, on any Intel-based Mac.

Commercial Mac OS X

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.

Free Open Source Linux

Xen

Xen.org, home of the Xen hypervisor, the powerful open source industry standard for virtualization.

Free Open Source Linux

VMware vSphere Hypervisor

VMware vSphere Hypervisor ( based on ESXi ) is a free bare-metal hypervisor that virtualizes servers so you can consolidate your applications on less hardware.

Commercial Windows Linux

virt-manager

The virt-manager application is a desktop user interface for managing virtual machines through libvirt. It primarily targets KVM VMs, but also manages Xen and LXC (linux containers).

Free Open Source Linux

Microsoft Hyper-V Server

Microsoft® Hyper-V™ Server 2008 R2 is a stand-alone product that provides a reliable and optimized virtualization solution enabling organizations to improve server utilization and reduce costs.

Commercial Windows Linux

Portable Virtualbox

portable-virtualbox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation. it unpacks and adjusts the paths and configuration of virtualbox so it will run portably.

Free Open Source Windows

MobaLiveCD

MobaLiveCD is a freeware that will run your Linux LiveCD on Windows thanks to the excellent emulator called "Qemu".

Free Open Source Windows

Citrix XenServer

XenServer is a turnkey open source virtualization solution that provides out-of-the box virtualization and cloud computing.

Free Open Source Windows Linux

clearVM

clearVM, formerly Witsbits, enables you to set up your servers with virtualization and deploy virtual machines faster than ever before.

Commercial Web

ASG-Remote Desktop

ASG-Remote Desktop is the indispensable tool for administrative access to remote computers.

Commercial Windows

OpenVZ

OpenVZ is container-based virtualization for Linux.

Free Open Source Linux

UCS Virtual Machine Manager

UCS Virtual Machine Manager (UVMM) is an easy-to-use and powerful administration tool for KVM.

Free Open Source Linux Univention Corporate Server

Paragon Virtualization Manager

A powerful tool to help you easily migrate a Windows-based computer to a virtual environment (P2V) of a major virtualization software vendor, regardless of how or where the computer is being backed up.

Commercial Windows

Boxes

A simple GNOME 3 application to access remote or virtual systems. It is based on a design from Jon McCann and Jakub Steiner.

Free Open Source Linux