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.
Swag Fair - Sustainable swag made by small businesses
SimilarSites - Easily find more sites like those you like.
Ethical Resources - Huge repository of ethical alternatives to mainstream stuff
Top Similar Sites - Top Similar Sites helps you find similar, alternative or related sites to any website instantly.
EcoAlternatives - Find eco-friendly alternatives to products you use everyday