Hoverink

HoverInk turns your webcam into a drawing surface. Pinch your thumb and index finger to lay down a line, and lean toward the camera to press harder — the stroke thickens as your hand gets closer.

• Pencil, line, rectangle, ellipse and eraser
• Two-handed pan, zoom and rotate
• Drop in images or PDFs to trace over, and move them with a closed fist
• Runs entirely in your browser.

Needs a webcam and a reasonably recent browser. Works best at about arm's length, with your hand well lit.