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Graph paramertic curves in rectangular as well as polar coordinates. Curves can be traced showing the direction of motion and the way a curve is traversed.

Collection with various multivariable calculus applets including: Contour Diagram Plotter; 3D function Grapher; Parametric Curves and Surface in spherical, cylindrical and rectangular coordinate;
This is a Java applet used to visualize the relation between various derivatives in differentiating a function of two variables along a parametrized curve.

This is a collection of images and animations of various concepts in multivariable calculus, including a plane tangent to a sphere, a function with two local maxima but no local minimum, and a

Collection of worksheets for use with Sage, covering differentiation, graphing functions, line integrals, and optimization.

Webpage describing how Kepler's Laws apply to binary stars, with supporting figures and equations.
Allows the user to "fire" projectiles on a 2D graph. User may adjust the initial velocity and angle, the mass of the projectile, and air resistance. Provides several languages.
Interactive java applet which allows the user to plot any two- or three-dimensional parametric curve together with associated tangent and normal vectors.
This java applet provides a variety of graphing functionality supporting multivariable calculus.