Drupal Customization
The most important changes are as follows: improvement in session cookie handling, better processing of big XML-RPC payloads, compatibility with PostgreSQL, PHP 5.3, PHP 4, CSS and JS, also improved login for login failures.
Joomla Customization
A very popular open-source CMS that is found at the heart of many well known websites.
WordPress
although geared for publishing blog, WordPress has proven that it can be a powerful CMS too, as you can see with my publisherfs custom publishing web site.
PhpNuke
a CMS and portal solution that features web-based administration, surveys, customisable blocks, modules and themes with multilingual support.
Plone
suited for building an intranet, web site or community site, Plone is a Content Management, Document Management and Knowledge Management system
Mambo
full-featured CMS that can be used for small or large websites; described as a gpowerful enough for the most demanding Internet or intranet site, simple enough for everyone to use!h