LissaApplet is a Java Applet that draws so-called Lissajous Curves, which are defined as follows:

x(t) =a* cos(f_{1}*t)

y(t) =b* cos(f_{2}*t+d)

The following two examples take their parameters out of the HTML code:

x(t) = cos(t)y(t) = cos(2t + π/4) |
x(t) = 5 * cos(3t)y(t) = 4 * cos(5t + π/2) |

GuiLissaApplet allows you to enter your own parameters and then passes them over to an embedded LissaApplet for drawing the curve:

The source: