Design Systems Repo - A collection of design system examples and resources
Figma Product Planner - Easiest way to plan, visualize, & share your product planing
Design Principles - An open source repository of design principles and methods
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Eva Design System - A free customizable design system
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.