PalmPlot - $6.99 / 5.00€

PalmPlot is a simple expression / graphing calculator inspired by the old Casio FX series.

Features: Hyperbolic, logarithmic, exponential, trigonometric functions. Variables and affectations. Derivatives, integrals and finite sums. Plot graphs of functions, in rectangular and polar coordinates, or plot parametric curves. Tables of values for functions. Numerical 1-var equation solver. 1-var / 2-vars statistics computations with editable data, histogram and scatter plot.

Special features: Simultaneous color plots, several number formats available, 26 variables, dozens of built-in functions, 3 customizable keys, searchable reference manual for functions.

Download a trial version, and then register it.

Ringtone librarian - $3.99

This application allows you to copy MIDI files stored on your memory card to the ring tones database of the Treo600 / 650 ; and archive the ring tones as MIDI files on the memory card.