SimilarStores - SimilarStores is a free tool that helps you to find similar stores to any store!
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.
Sites Like - Siteslike opened it's doors to the public on the 4th of december in 2008, since that time...
SimilarSites - Easily find more sites like those you like.
moreofit.com - Moreofit is the first (and best) website similarity search engine.
Product Hunt - A website that lets users share and discover new products