https://github.com/tasket/Qubes-scripts
(non-exhaustive list)
qubes4-multi-update: Updates multiple template and standalone VMs
configure-sudo-prompt: Restores internal VM security so that authorization is required to gain root access
findpref: Dom0: Find all VMs that match a pref value, optionally set new values for them. For example, its a handy way to switch all VMs that are using a particular netvm to a different netvm.
halt-vm-by-window: A simple way to shutdown a Qubes VM associated with the currently active window. Before shutdown, any running instances of Firefox or Thunderbird in that VM will be told to quit; this allows the apps to save their open-tabs state.