What it is:
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.
To know more about:
sudo apt-get install easystroke