Calcpack: Contains a collection of programs useful for Calculus I students.
Send Calcpack.83g to your calculator.

Euler
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    Graphs differential equations using the Euler method.  Put the equation Y'(X,Y) in Y1.  For example, the equation Y'=X+Y is put into Y1=X+Y.  Can also create a table of values given an initial (X,Y).

Riemann
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    Approximates the integeral using Riemann sums.  Put the equation into Y1.   Can find the Left/Right and Trapezoidal Riemann sums, as well as the Midpoint Riemann sum.

Simpson
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    Uses Simpson's Rule to approximate the integral.  Put the equation into Y1.

Slopefield
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    Draws a slopefield with the differential equation Y'(X,Y) in Y1.