National High Magnetic Field Laboratory
Magnet Academy: Lissajous Figures on an Oscilloscope
This Java tutorial is a three-dimensional simulation of a cathode ray oscilloscope producing Lissajous figures as it compares sinusoidal voltages.
University of St. Andrews (UK)
University of St. Andrews: Lissajous Curves
Gives a brief history and lists the parametric cartesian equations.
University of St. Andrews (UK)
University of St. Andrews: Lissajous Curves
This site, which is provided for by the University of St. Andrews, allows you to zoom in/out and add evolutes, involutes, etc.