Wappalyzer.com is a popular website that provides vital insights into the technologies behind other websites. It offers a browser extension for Firefox and Chrome, allowing users to identify the software and tools being used by various websites just with a single click. Wappalyzer analyzes the underlying code and provides detailed information on the content management systems (CMS), e-commerce platforms, web servers, analytics tools, JavaScript frameworks, and more. This website is a valuable resource for web developers, marketers, and researchers who want to gather intelligence on their competitors or stay updated with the latest trends in web technology.