Excalidraw

Excalidraw is an open-source virtual whiteboard that brings a unique hand-drawn aesthetic to diagramming, making brainstorming and collaboration more engaging. It enables real-time sketching, allowing users to share ideas and receive live feedback securely with end-to-end encryption. The tool is incredibly user-friendly, requiring no setup or downloads, so you can start creating visually appealing diagrams instantly for various projects and team activities.