QtEmu is a graphical user interface for QEMU and KVM written in Qt4.
I found that once the virtual machine had been created I could not start the FreeDOS installer within QtEmu either from a floppy image or an ISO. I did manage to start the FreeDOS installer within QtEmu from a CD burnt from the ISO. When I close the application QtEmu stays in memory and uses 97% of CPU time and the process has to be stopped with the Task Manager. I am using Windows XP SP3 which it must support since it was released in 2007. QtEmu can only open IMG and ISO images (if it can open them at all). It cannot open IMA, VHD and VFD images. Not impressed. Another complete waste of time from Sourceforge.
Used it for a Windows XP virtual machine, works great and no problems (besides not being able to mount native CDs, but it wasn't an issue for me).