virt-viewer (lightweight graphical display for libvirt VMs) The "Virtual Machine Viewer" application (virt-viewer for short) is a lightweight interface for interacting with the graphical display of a libvirt guest OS. It is intended as a replacement for the traditional vncviewer client, since the latter does not support SSL/TLS encryption of x509 certificate authentication. This software requires gtk-vnc and optionally, spice. If built without libvirt, this package will only contain the remote-viewer client, a simple VNC/SPICE viewer.