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.
Greenlight - An app that grades and recommends sustainable shopping.
Product Hunt - A website that lets users share and discover new products
Swag Fair - Sustainable swag made by small businesses
Softpedia - A library of over 1,000,000 free and free-to-try applications for Windows, Mac, Linux and Smartphones, Games and Drivers plus tech-focused news and reviews
Ethical Resources - Huge repository of ethical alternatives to mainstream stuff