Yes. It's available here:
http://www.tmib.net/agencies-dropdown-and-admin-ui-osticket-17st(http://www.tmib.net/agencies-dropdown-and-admin-ui-osticket-17st)
You can name the drop down whatever you want, I chose "Agency" as it best fit my implementation criteria. It also gives you a means to edit, update, delete, etc your options in the admin panel.