TYPO3 is an Open Source CMS and enjoys great success in Northern Europe. More than 300,000 websites use this system.
Umbraco is an Open Source CMS based on Microsoft's ASP.NET that supports any browser.
Joomla is an Open Source System used the world over with a very recognized CMS.
WordPress is an open source CMS with many functionalities and modules, often used as a blog system.
Drupal is an open source CMS with many functionalities and modules, supporting bigger web solutions.
FatWire CMS is for professional users with user-friendly tools making it easy for marketing people to optimize the customers' online experience.