Unfortunately, the multiple gallery template is not available for download but you can view the source of the web page in your browser (depending on your browser, you can do so via 'Tools -> Web Developer -> Page Source' or something similar) and copy/modify the code to suit your own needs. (Some knowledge of HTML would be useful.)

If you are looking for an automated solution to creating and listing multiple galleries, then you might be interested in another one of our products, namely Showkase.

Showkase is a PHP web application (installed on your web server instead of your computer) which allows you to create a complete portfolio web site (integrating multiple galleries) online.
Showkase has full support for Juicebox-Pro and the galleries can be created within the application itself in a web browser interface (or created with JuiceboxBuilder or the Juicebox plugin for Lightroom and imported).

You can create Gallery Index pages and have as many galleries listed on each Gallery Index page as you wish.
Each gallery is represented by a thumbnail image with the gallery title displayed below and the gallery is opened when the user clicks on the image.
Demo sites created with Showkase can be found here and a sample Gallery Index page can be found here.

Showkase can also create non-gallery pages (About, Basic and Contact pages) where you can add information about yourself (or any other content you like).
All of this is done automatically within the Showkase interface without the need for any manual coding at all.

Showkase can be purchased as Showkase-Standard (which comes with Juicebox-Lite, the free version) or Showkase-Pro (which comes with Juicebox-Pro).
The only difference between Showkase-Standard and Showkase-Pro is the bundled viewer (Juicebox-Lite vs Juicebox-Pro).

If you already have Juicebox-Pro, then you could purchase Showkase-Standard (if you wanted to) and integrate your Juicebox-Pro files by following the Installing a Pro Viewer instructions.