Wappalyzer is a browser extension that uncovers the technologies used on websites.
Lightbeam is a Firefox add-on that uses interactive visualizations to show you the first and third party sites you interact with on the Web. As you browse, Lightbeam reveals the full depth of the Web today...
Web technology information profiler tool. Find out what a website is built with.
Cross platform, cross browser, multi purpose tool for web developers, designers & webmasters
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