b2\cafelog, more commonly known as simply b2 or cafelog, was the precursor to WordPress. b2\cafelog was estimated to have been employed on approximately 2,000 blogs as of May 2003. It was written in PHP for use with MySQL by Michel Valdrighi, who is now a contributing developer to WordPress. Though WordPress is the official successor, another project, b2evolution, is also in active development.
Joomla! came into being as the result of the fork of Mambo by the development team on August 17, 2005.
Originally written by Dries Buytaert as a message board, Drupal became an open source project in 2001.[6]Drupal is an English rendering of the Dutch word “druppel”, which means “drop” (as in “a water droplet”).[7] The name was taken from the now-defunct Drop.org website, whose code slowly evolved into Drupal.
Joomla! is a free open source content management system for publishing content on the World Wide Web and intranets as well as a Model–view–controller (MVC) Web Application Development framework. The system includes features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization.

WordPress is an open source blog publishing application. WordPress is the official successor of b2\cafelog which was developed by Michel Valdrighi. The latest release of WordPress is version 2.7.1, released on 10 February 2009.