Unix gets a bad rap for having an abundance of many needless flavors when — since they all use the same OS — most of the time you’re getting a choice of vanilla, french vanilla, and fat-free vanilla.
But worse than that is the proliferation of more varieties of content management systems then there has any reason to be. Why should I feel limited to just Drupal or Joomla, when there’s tons of suck to go around? If you’re building a new website and would much rather learn some other programmer’s (or worse, a committee of programmers) byzantine system of content management, visit http://www.cmsmatrix.org to view this utterly baffling plethora.