IdeasDrop - A social community for sharing and validating new ideas.
Figma Product Planner - Easiest way to plan, visualize, & share your product planing
Bonki Boilerplate - Test your idea in days not months
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Sprint - How to solve big problems and test new ideas in 5 days
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.