Invision - Prototyping and collaboration for design teams
Design Systems Repo - A collection of design system examples and resources
Marvel - Turn sketches, mockups and designs into web, iPhone, iOS, Android and Apple Watch app prototypes.
Eva Design System - A free customizable design system
UXpin - Design is really about solving problems. UXPin is the UX Design Platform that gets that right.
Ant Design System for Figma - A large library of 2100+ handcrafted UI components