tldraw is a free, real-time collaborative drawing tool. It provides a rich set of graphic elements and drawing functions, enabling users to quickly create various types of charts and flowcharts. tldraw allows users to draw UI on a whiteboard and generate a functional website supported by real code using GPT-4 Turbo and Vision. It supports real-time collaboration for multiple users and offers features like version control and commenting. tldraw is suitable for work, study, planning, and other scenarios, making it an excellent productivity tool.