SimilarWeb - SimilarWeb.com is a website analysis tool that gives you analytics information for any website.
SimilarSites - Easily find more sites like those you like.
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
Similar Site Search - SimilarSiteSearch helps you find similar, related, or alternative websites.
Top Similar Sites - Top Similar Sites helps you find similar, alternative or related sites to any website instantly.
Site Rank Data - View historical rank information of websites via time series charts.