Pythia is a scientific and engineering freeware software developed for Palm, that allows you to solve simple equations. It has a pretty good looking interface, where equations can be accessed using in-graph buttons over variables. Finally, the unknown variable, is simply the one that you left blank!

Pythia can solve these equations:

Area

* Triangle

* Sphere

* Parallelogram

* Circle

* Ellipse

* Cylinder

Volume

* Cube

* Cone

Mathematics

* Arithmetic progression sum

* Arithmetic progression product

* Geometric progression sum

Gravitation

* Law of Universal Gravitation

Dynamics

* Relativistic correction

Electromagnetism

* Cylindrical conductor resistance

Electronics

* Ohm's Law

Statistics

* Normal distribution probability density function

* Binomial distribution probability density function

Hydraulics

* Hydraulic press

Updated Description:

v1.1

* Added new equations.

* Released as freeware.