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HTTP headers can provide some of the best clues about a site's CMS. The values of set-cookie and x-powered-by headers are the most common and easiest to find.
If a CMS doesn't have meta tags, it will often have other uniquely identifiable html markup. This can range from unique html comments, ids or classes.
In addition to detecting the CMS, in some cases we are able to accurately detect which version of the CMS is being used.
Dedicated Content Management System Detection