#Multi-touch

taye

interact.js

JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE9+)

H-M-H

Weylus

Use your tablet as graphic tablet/touch screen on your computer.

leongersen

noUiSlider

noUiSlider is a lightweight, ARIA-accessible JavaScript range slider with multi-touch and keyboard support. It is fully GPU animated: no reflows, so it is fast; even on older devices. It also fits wonderfully in responsive designs and has no dependencies.

jkuhlmann

gainput

Cross-platform C++ input library supporting gamepads, keyboard, mouse, touch

mkalten

reacTIVision

computer vision framework for tangible interactive surfaces