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:
Many enhancements were made, including support for several new operating systems, integration of ACE authoring features, the ability to start VMs in streaming mode, an installation wizard GUI with an alternative command line mode, an "Easy Install" option for unattended installation of several Windows OSs and Linux distributions, Unity mode, accelerated 3D graphics for Windows XP guests, a graphical virtual network editor for Linux hosts, enhancement of VM record and replay, virtual hardware updates for hot-plugging, and more.