Water & Stone, a web development company specializing in Open Source technologies, released a popularity survey of open source content management systems. In the analysis of 19 of the most prominent open source content management systems, Water and Stone evaluated CMS’s on the basis of Rate of Adoption and Brand Strength, as well as a variety of other viability indicators and trends.
The TOP 19
Note: I would exclude from the list three projects, because this three software are not really a CMS. Elgg (social networking software), MediaWiki (wiki software) and Pligg (social news software).
The Market Leaders : Drupal, Joomla! and WordPress.
The data gathered during this survey makes a persuasive case for the identity of the Top 3 leaders in the open source CMS market. In almost every metric, the Top 3 spots were held by Drupal, Joomla! and WordPress. Moreover, not only did these systems consistently finish at the top of the comparisons, in many cases the gap between those three systems and the rest of the pack was significant. In key Adoption and Brand metrics these three names showed not just strength, but dominance.