This applet encompasses five different applets on different topics and at different levels. (The user can access each topic via Course Activity tab.) The first activity consists of a simple function grapher that graphs a pre-defined function from a large collection of functions and two user-defined functions. (Very easy zoom-in and zoom-out functionality that can be used to illustrate local linearity.) The second activity provides an interactive illustration of the Mean Value Theorem. The third part shows the Newton's method in action. The fourth activity shows Riemann sums and several numerical integration methods, including the midpoint and the trapezoid rules. Finally, the last activity demonstrates the definite integral in terms of areas. All activities are interactive: the user chooses a function, an interval, a starting point, the number of divisions, etc. depending on the activity.