This is a new release of my simple EBOOT calculator designed to fill in functionality that Sony neglected in their firmware. (Even M$ Windows comes with a free calc in the OS.)
I know there are other calculators but this one strives to be a simple, fast EBOOT. Also, it is now released under the GPL - an open source license. The source code is included in the download .zip file along with 1.0 and 1.5 eboot folders.
Screenshot: (the text in the calc screen window is NOT that bright. It is dark but my screen cap must have gotten corrupted somehow. I was using the graphics.h saveImage() function.)