Design Principles - An open source repository of design principles and methods
Facebook Design Resources - A collection of free resources made by designers at Facebook
Product Disrupt - A design student's list of resources to learn Product Design
Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
The modern web design process - An in-depth guide to the processes behind great websites.
Atlassian Design - Design, develop, and deliver