CMS with a core installation

Hello,

Does anyone know of a CMS system which is built upon a core installation?

Example:
You install the core in /var/www/
You have multiple sites in their own structure e.g. /var/www/site1/
But the core files are used by all the sites, except of course their own configs and themes, etc

Thanks,
Karl

 

I would take a look at Wordpress Multisite. Pretty close to what your looking for: http://codex.wordpress.org/Create_A_Network

 

Sorry but I can't stand Wordpress.

I know most of the larger CMS's can do this, Joomla, Drupal, Wordpress, but I'm looking for something smaller, lightweight and more customisable from a programming side of things.