Distribution	Version	vmWare Compatible (VirtualBox)	QEMU/KVM
CentOS/RedHat EPEL	4 5 6	.vmdk (xxGB) .gz (xxGB) .bz2 (xxGB) .vmdk (xxGB) .gz (xxGB) .bz2 (xxGB) .vmdk (5.2GB) .gz (1.7GB) .bz2 (1.5GB)	.qcow2 (xxGB) .gz (xxGB) .bz2 (xxGB) .qcow2 (xxGB) .gz (xxGB) .bz2 (xxGB) .qcow2 (xxGB) .gz (xxGB) .bz2 (xxGB)
Fedora	17 18 19	.vmdk (xxGB) .gz (2.9GB) .bz2 (2.6GB) .vmdk (xxGB) .gz (xxGB) .bz2 (xxGB) .vmdk (xxGB) .gz (xxGB) .bz2 (xxGB)	.qcow2 (xxGB) .gz (xxGB) .bz2 (xxGB) .qcow2 (xxGB) .gz (xxGB) .bz2 (xxGB) .qcow2 (xxGB) .gz (xxGB) .bz2 (xxGB)
Debian (soon)
Ubuntu (soon)

You will need a virtual machine manager. If you are not familiar with these, we recommend Oracle Virtual Box.

After you downloaded the image you chose, you can easily import your image/appliance. All these images are preconfigured but feel free to allow more ressources in your VM manager for a smoother TvlSim experience.