The Wayback Machine - https://web.archive.org/web/20130806231531/http://trends.builtwith.com/cms/

CMS Usage Statistics

Statistics for websites using CMS technologies

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Name 10k 100k Million Entire Web
WordPress 901 10,965 205,207 6,358,456
Drupal 336 3,206 23,214 410,613
Thomson Reuters Corporate Solutions 125 430 2,345 3,868
Adobe CQ 67 200 547 454
vBulletin 66 837 11,354 13,733
Adobe Scene7 52 159 930 2,695
WordPress VIP 42 107 297 184
Joomla! 41 1,490 31,382 1,705,559
ExpressionEngine 40 628 4,095 38,055
Demandware 39 143 529 872
Interwoven TeamSite 39 111 457 254
iAPPS 37 412 2,046 337
Crystal Scripts 35 492 948 1,323
WP Engine 32 160 815 2,562
tumblr 28 213 5,494 26,702
Sitecore CMS 28 208 818 2,432
Ektron 24 398 1,369 4,128
Sitefinity 24 330 1,522 175,681
Ektron Ecommerce 24 365 1,236 2,863
Endeca 23 56 322 275

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A content management system provides structured content management features such as the ability to store news documents, images, video and any other online content type imaginable. They are used for websites that normally have multiple editors and sections and are used as the foundation on many large websites which include newspapers and governments.