Wolfram Research
Wolfram Math World: Conchoid of Nicomedes
This site gives an approximate date at which the cochoid was studied by Nicomedes, explains what the locus of points are which make up this curve, and give cartesian and polar coordinates for such a curve, as well as a formula for the...
Other
College of the Redwoods: Conchoid Nicomedes
This resource derives the equations and gives several examples of Conchoid Nicomedes.
University of St. Andrews (UK)
University of St. Andrews: Conchoid of De Sluze Applet
Zoom in and out, and add evolutes, involutes, etc.