This applet allow you to enter f(x) and range of x, and the program will calculate the integration for f(x).
Drag the mouse inside the simulation region, will show the correspond y=f(x) and it's integral \int f(x) dx.

VIEW or DOWNLOAD ejs xml source
then click to translate strings for selected locale.

Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.