Think Kit is a new addition to Paper, a popular and free iPad app for sketching notes and drawing. Think Kit offers tools for creating diagrams, flowcharts, and mind maps. Within Think Kit you will find a Diagram tool for drawing straight lines, connecting lines, and drawing shapes. The Fill tool in Think Kit allows you to color the shapes in your diagrams. Think Kit's cut tool makes it easy to cut and move shapes in your diagrams.
Via John Evans