Easystroke is a gesture-recognition application for X11. Gestures or
strokes are movements that you make with you mouse (or your pen,
finger etc.) while holding down a specific mouse button. Easystroke
will execute certain actions if it recognizes the stroke; currently
easystroke can emulate key presses, execute shell commands, hold down
modifiers and emulate a scroll wheel.
The program was designed with Tablet PCs in mind and can be used
effectively even without access to a keyboard. Easystroke tries to
provide an intuitive and efficient user interface, while at the same
time being highly configurable and offering many advanced features.