Inline Tex:

Inline link:

Integrated vector-graphics drawing program with TeX support.

Some helpful information related to drawing wiggly lines in the above example:

In the slide-out drawer, next to the stroke-color and stroke-thickness controls, are a series of other controls, one of which gives you dashed (etc) strokes.

The wiggly line can be drawn as a path, with anchor points located, at regular intervals, along a line (easy, if you turn on the grid background), with slopes of equal magnitude, alternating in sign (again, easy to do, if you use the grid).