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.
Ethical Resources - Huge repository of ethical alternatives to mainstream stuff
SimilarSites - Easily find more sites like those you like.
Swag Fair - Sustainable swag made by small businesses
Product Hunt - A website that lets users share and discover new products
Moincoins - Cashback, coupons and rewards for small tasks.