Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Design Principles - An open source repository of design principles and methods
InVision Studio - The world’s most powerful screen design tool
Atlassian Design - Design, develop, and deliver
Facebook Design Resources - A collection of free resources made by designers at Facebook
Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.