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Virtualization Tools - What's Free, What's Not and What's it do?

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Rover:
As a follow-up to a recent ICQ discussion, mouser asked someone (I volunteered) to write up the status of the Virtual Machine Software in the world today.  Or at least the world as we know it.  :P

VMware has several offerings, both Free and Not Free.  Their list of Free Virtualization Products can be found here:
http://www.vmware.com/products/free_virtualization.html

The summary of which is:

VMware Player
- Run, share and evaluate pre-built applications and beta software in virtual machines with VMware Player.
- You cannot create VM's with the Player.

VMware Server
- Runs on Windows or Linux, i386 or x86_64
- Create Virtual Servers and/or Workstation (No sound support)
- VMware Server replaces VMware GSX which requires an Operating System to install.

VMTN Virtual Appliances
- Download pre-installed and pre-configured applications that run in a virtual machine. Provided by VMware partners.

NON-FREE VMware Products
VMware Workstation
Use the VMware virtualization platform for development and testing and see immediate improvement in time to market, costs, and quality. Enterprise development organizations can consolidate servers and desktops used in test and development; copy exact multi-module production environment into virtual machines for testing; eliminate repetitive configuration tasks from development and testing cycles and simulate complex multi-tier applications on a single physical platform.-VMware
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VMware ESX
This is VMware's serious enterprise stuff.  Create Virtual Servers and Manage Virtual Servers from your web browser.  Cluster physical servers to increase reliability.  Add VMotion to migrate Virtual Servers from one physical system to another while they are running.  Includes built-in cluster file system for simultainous access to data from different ESX Servers. 


Microsoft Vitrual Server 2005
In conjunction with Windows Server 2003, Virtual Server 2005 R2 provides a virtualization platform that runs most major x86 operating systems in a guest environment, and is supported by Microsoft as a host for Windows Server operating systems and Windows Server System applications. Virtual Server 2005 R2's comprehensive COM API, in combination with the Virtual Hard Drive (VHD) format and support for virtual networking, provide administrators complete scripted control of portable, connected virtual machines and enable easy automation of deployment, and ongoing change and configuration.-Microsoft
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Free.  Currently at Beta 2.  See more here: http://www.microsoft.com/windowsserversystem/virtualserver/default.mspx

Microsoft Virtual PC w/ SP1
Virtual PC 2004 Service Pack 1 (SP1) is a powerful software virtualization solution that allows you to run multiple PC-based operating systems simultaneously on one workstation, providing a safety net to maintain compatibility with legacy applications while you migrate to a new operating system. It also saves reconfiguration time, so your support, development, and training staff can work more efficiently.
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Free.  See the site: http://www.microsoft.com/windows/virtualpc/default.mspx


From Xensource
Industry leading open source hypervisor virtualization technology. The Xen 3 hypervisor has the features and performance for production environments. Supports Intel VT, AMD Virtualization, 32-way SMP, PAE, and 64 bit addressing.-Website
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Free, but requires a modified kernel to run.

Also from Xensource
Xen Enterprise - XenEnterprise™, the first commercially packaged and supported Xen solution, enables you to easily get Xen up and running. It’s an integrated package that includes a comprehensive tool set to simplify deployment, provisioning and management of a Xen-based virtual infrastructure.
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Not Free.  See Xensource for details. 
http://www.xensource.com/products/


To Sum Up
VMware has 2 Free offerings:  A Player that plays pre-created Virutal Machines, and VMware Server, a free Server oriented virtualization product.  They also have VMware Workstation and ESX Server as commercial products.

Microsoft has a free Virtual Server and Virtual PC.

Xensource has a Free and and Commercial Enterprise version.

Virtualization is here to stay.  I have used VMware Server since the early betas and it is very fast and stable.
I have not used the others.  Give them a try and let us (all here at DC) know what you think.  :Thmbsup:

Please feel free to add or correct information here as needed.

[Edit Note: Thanks to Mouser for pointing out the Missing Virtual PC - d'oh!]

mouser:
Don't forget parallels:
http://www.parallels.com/

Parallels Workstation is a powerful, easy to use, cost effective desktop virtualization solution that empowers PC users with the ability to create completely networked, fully portable, entirely independent virtual machines on a single physical machine.

Parallels Workstation 2.1 - $49.99
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app103:
and Bochs(free/open source):

http://bochs.sourceforge.net

Bochs is a highly portable open source IA-32 (x86) PC emulator written in C++, that runs on most popular platforms. It includes emulation of the Intel x86 CPU, common I/O devices, and a custom BIOS. Currently, Bochs can be compiled to emulate a 386, 486, Pentium, Pentium Pro or AMD64 CPU, including optional MMX, SSE, SSE2 and 3DNow! instructions.
Bochs is capable of running most Operating Systems inside the emulation including Linux, DOS, Windows® 95/98 and Windows® NT/2000/XP.

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tons of screenshots here:

http://bochs.sourceforge.net/screenshots.html

f0dder:
And QEMU, which has a "kernel-mode acceleration module" for faster virtualization, whereas BOCHS does full emulation of all instructions (S L O W!)

app103:
BOCHS does full emulation of all instructions (S L O W!)
-f0dder (July 17, 2006, 07:01 AM)
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I have heard that about it. But I have also heard that it is of more use to someone writing their own OS, rather than someone looking to run an OS virtually in order to try one out, or for testing applications on one.

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