W3Techs

This source monitors the use of various technologies on the web and publishes daily updates of their data. These technologies include Content Management systems, Server-side Languages, Client-side Languages, JavaScript Libraries, Markup Languages, Character Encodings, Image File Formats, Site Elements, SSL Certificate Authorities, Social Widgets, Web Servers, Operating Systems, Content Delivery, Traffic Analysis Tools, Advertising Networks, Tag Managers, Top Level Domains, and Content Languages. Its site allows users to search for a specific website and get details on the technology it uses, and sells in-depth reports based on the data it collects.

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