Finding the platform that was used to build a website

How can you find the technology that was used to build a website? I know isitwp.com -  tells you if it's WordPress and Wix and Weebly usually identify themselves early in the source. But how about sites like www.pingdom.com or www.gotoassist.com?

Thanks
stevaAsked:
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Maidine FouadEngineerCommented:
i use wappalyser addon with w3tech extensions  , this will give you every detail you need :

https://wappalyzer.com/

https://w3techs.com/sites

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Dave BaldwinFixer of ProblemsCommented:
You can also use 'built with' http://builtwith.com/ .  On most of my sites, it is pretty misleading because even though there is a Wordpress blog, 95% of the sites are custom and don't use any framework.
stevaAuthor Commented:
Excellent!  Thank you!
stevaAuthor Commented:
Thanks Dave.  That one looks good too.
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