CMS

Wordpress.com is a popular blogging platform. You can use it free of cost and from any operating system. You don't need to bother for setting up the software, hosting the blogging software, and registering domain names. This video tutorial shows you how to start blogging with WordPress.com.

WordPress.com - Step-by-Step Tutorial on How to Blog

Drupal is one of the most popular content management systems. It is modular, extensible, customizable and powerful. Unlike Joomla!, which uses Object Oriented Programming (OOP) approach, Drupal uses fully procedural approach. Drupal’s code base is minimal and simple to understand. Like Joomla! you can develop modules (equivalent in Joomla! is called extension) to extend Drupal’s functionalities.