phoc is a programmable calculator, which stand for Programmable Hign-Order-Calculator, and powered by script language, currently is JavaScript. But it's may language-independent, I'll add python later to pcalc.

Expression evaluation phoc can of course do the normal compute such as expression evaluation:
(1+2)*8/6 sin(PI)*cos(PI/2)

Define functions also, phoc can support user-defined function, such as:
function add(x, y) {return x + y; } add(3, 5)
or
function sum(){ //code to calc sum } sum(1, 3, 34, 566, 57, 6, 7, 78, 787)

Requirements:
* Java

The license of this software is Free, you can free download and free use this calculator software.