SimilarSites - Easily find more sites like those you like.
Graphiq - Vivid, contextually-rich visualizations of the world's deepest knowledge graph.
Top Similar Sites - Top Similar Sites helps you find similar, alternative or related sites to any website instantly.
vsChart.com - With vsChart.com you can compare products and a lot more.
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.
Diffzi - Diffzi.com lets you compare anything.