W3Techs

W3Techs provides information about the usage of various types of technologies on the web. Technologies include content management systems, server-side and client-side programming languages, JavaScript libraries, markup languages, character encodings, web servers, operating systems, traffic analysis tools and advertising networks. The types of surveys provided are usage statistics, historical trends, technology changes and cross-technology statistics. Reports on technologies used by individual websites are available, which include quality alerts in case of potential technical problems on the site. Webmasters can register their sites to get informed about quality alerts.