Figma

Maze is a user research platform for testing prototypes, surveys, and concepts with real users. It turns designs into interactive tests and delivers actionable metrics. It was founded in 2018.

Framer lets you design and publish responsive sites visually, with real CMS, animations, and SEO built in. Go from idea to live in an afternoon.

Whimsical is a visual collaboration workspace with flowcharts, wireframes, mind maps and boards. Teams brainstorm and map processes together with real-time multiplayer editing.

Excalidraw is a free, open-source virtual whiteboard for sketching diagrams in a hand-drawn style. It supports real-time collaboration and exporting, and runs directly in the browser.