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There is a current service - builtwith.com - that does a nice job of productizing this type of research - eg:


It looks like Builtwith only has a few predefined technologies. NerdyData can search for any string in HTML or JS files on millions of websites and do regular expression searches as well.

Here is an example search that can extract the IDs from Google Analytics code on websites into a downloadable list https://nerdydata.com/search?query=UA-%5Cd%2B-%5Cd%2B&regex=...

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