Facebook Design - Resources for Designers from the Facebook Design team
Invision - Prototyping and collaboration for design teams
Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Straple - An end to end design system in Sketch and ReactJS
Craftwork - A collection of User Interface resources made by Craftwork