Applets below are known to work with

Netscape Communicator Version 4.06 or later.

Graphing Utility for Parametric Curves (by Eugene Serdiouk)

Graphing Utility for Polar Curves (by E.S.)

Vector Fields and Line Integrals (by E.S.)

Visualizing Vector Fields and First Order ODE's (by E.S.)

Tutorial on Determinants (by E.S.)

Utility for Matrix Manipulation (by E.S.)

Two-dimensional Newton Method (by E.S.)

Gradients and Level Curves (by E.S.)