VMware 6.5 Beta Build 110068 (Workstation Development branch)

VMware allows you to run 'virtual machines' inside a Linux host. It is not an emulator. It provides a virtual computer within the host which can boot whichever OS you decide to put on the filesystem image that is used as a harddrive. It will run DOS 6.22, Win 3.1, Win9x, WinNT/2000/XP/2003, Linux, Novell, and more. The only main requirement is a 400 MHz or better machine, along with lots of RAM (128M minimum, 256M recommended). License: Other/Proprietary License with Free Trial Changes:
Several new operating systems are officially or experimentally supported as guests or hosts. ACE authoring features are now fully integrated with Workstation. VMs can now be started in streaming mode (before completion of download). Installation is now done with a bundle providing a wizard GUI and an alternative command line mode. The new "Easy Install" option allows unattended installation of several Windows OSs and Linux distributions. A graphical virtual network editor was implemented for Linux hosts. Several virtual hardware enhancements were made. Many other improvements were made.

More...