QEMU is a generic and open source machine emulator and virtualizer. It supports most common virtualization architecture pairings. With the portable QEMU-Manager (1) and with KVM you can start without conversion virtual machines with harddisks based on vdmk-files from VMware machines and hope to find instructions to play such machines as with VMware player. (1) http://www.portablefreeware.com/?id=640 . Download for WinNT / Win2K / WinXP / Vista / Win7 from (1). No Admin-rights for QEMU-Manager nec... More info »
I used to test QEMU under Ubuntu. In 3 hours or so I even had an XP installed. Unfortunately, everything went 3-4 times slower that it did with VMWare, so it was just unusable.
please somebody add this icon: http://images.pbidir.com/progicons/qemu.png
Its a nice little emulator and has some nice features, but I recommend Virtual box over this program. I had too many problems and it was too confusing and difficult to get anything to work on this program.