Viral Coefficient Calculator - Calculate a viral referral loop for apps
Design Principles - An open source repository of design principles and methods
YesGraph - Boost viral growth by recommending who users should invite
UX Research Field Guide - Your map to the world of UX research 🌏🕵️♀️
Viral Loops for Startups - Virality for startups made easy 💪
Business-Driven Digital Product Design - A guide on how to create influential user experience