A WordPress (tested with version 3.8) child theme for Twenty Thirteen in a flat modern (responsive for tablets and mobiles) style for a portal area based on Twitter Bootstrap 2.3.2.
Use custom page templates and custom menus to control public and private areas of your website to different user levels.
Also has a custom login page and a custom post type for adding public news.
Normal posts are private and visible only to the set logged in author (could use as a basic ticket system)
Works well and tested with BuddyPress (1.9 latest) and BBPress (2.5.1 latest).
Includes support for the Easy Digital Downloads plugin as well (shop posts set to public view)
Using WordPress you can avoid subscription costs for a simple private portal solution and have unlimited users.
WordPress is very easy to use and can be extended and modified to whatever you need with free and premium plugins.
This theme includes Twitter Bootstrap 2.3.2 css and jquery and glyphs.
Go to the Twitter Framework site to see what other components and jquery scripts you can use with this theme.http://getbootstrap.com/2.3.2/