Use a third-party CSS or JS Framework, a self-hosted service like a CRM, or a third-party service with the site.

PageWatchers

INTRODUCTION

This module allows you to display the number of the users currently on any particular page. That's it!

Bootbox.js

Summary

This module loads Bootbox.js via Libraries API, regardless of the theme you are using.
It does nothing else.

Pages

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