I would like to add two apps which uses libvirt the site.

Ruby Objects for libvirt

based on top of the native ruby binding, Virt ruby gem exposes real objects such as Host, Guest, StoragePool, Interface etc.

more info at https://github.com/ohadlevy/virt

Foreman - Web UI for provisioning and managing servers

Among the many things foreman can do, It provides to relevant parts to libvirt:

UI to list / start / stop / destroy vms

UI to create a new vm as part of the provisioning process (e.g. dhcp, dns, tftp, pxe, vm, ks/preseed, puppet etc)

more info at http://theforeman.org

Thanks!

Ohad