Find whether a website is using WordPress or Blogger or Joomla or Drupal or any other Content Management Systems. The platform or the CMS of the website is displayed as you browse through web pages.
These Chrome extensions will identify CMS, Programming Languages, Traffic Analytics tool used by the website, Advertising network used by the website, type of server and much more.
[ Note: Chrome sniffer extension seems to be removed from Chrome Webstore ]
If you are looking for web tools or Firefox addons to detect website technologies, use the below guides.