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.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Top Similar Sites - Top Similar Sites helps you find similar, alternative or related sites to any website instantly.
CamFind - CamFind is the very first mobile application that can photograph, identify, and provide information...
SimilarSites - Easily find more sites like those you like.
NISE - The NISE Image Search Engine is a reverse image search engine (like tineye.