* 1.5 Update *

All -n- Calculator is not just another calculator app but is a collection of useful calculators. It consists of a tip calculator, mortgage calculator, auto loan calculator, sales calculator, basic calculator and a conversion calculator that converts the more common units of measure.

Function Plot is a powerful and easy to use Android application, able to draw the graph of any function F, within a defined (x1, x2) space. The user of the application is able to get any “x, F(x)” pair values, by just touching the function graph on the device screen. Using this last facility, he/she is also able to approach the roots of the equation “F(x)=0”.

Currency Converter and Calculator with 180+ currencies, 4 metals, HD commands

Scientific calculator and can also do integration, differentiation, and matrices.You enter mathematical expressions the same way you are used to in writing.Any expression can be expressed.

FX-602P Programmable Calculator is a programmable scientific calculator based on the FX-602P. See the FX-602P website
or blog
for details

CalInverse is calculator with modular arithmetic and theory of numbers.
Functions include:
*Greatest common divisor (GCD) (Euclidean algorithm);
*Least common multiple (LCM);
*Bezout's lemma;
*Modular multiplicative inverse;
*Chinese theorem for a system of 2, 3, 4 equations.
The program does not require access to the internet.