Design Principles - An open source repository of design principles and methods
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Colorbox.io - Create accessible color systems 🎨
Adobe XD - Adobe XD is an all-in-one UX/UI solution for designing websites, mobile apps and more.
Product Disrupt - A design student's list of resources to learn Product Design
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.