Each year, Packt Publishing conducts a competition to determine the top open source content management system. Nominations are accepted from the general public for several weeks, then tabulated to determine the top 5 in each of several categories - Best Overall, Most Promising, Best PHP and Best Other. New this year was a Hall of Fame award for previous winners in the Best Overall category.
1st place winners in the 2009 competition were WordPress, Drupal, ImpressCMS and Plone.
Here are the 2009 winners in each of the categories -
Overall Best Open Source CMS Award
Hall of Fame Award
Most Promising Open Source CMS
Best Open Source PHP CMS
Best Other Open Source CMS
Individual contributors to open source projects were also recognized in the Open Source Most Valued People category.