strongdisk pro is the most proven and reliable on-the-fly encryption software exists on the market. it makes a plain hard disk into a data strongbox that can be accessed by its owner only.
this graphing calculator offers a professional solution for anyone who graphs functions. it helps to create 2d, 2.5d function graphs(cartesian and polar), 3d curves, surfaces (cartesian, cylindrical and spherical), animations and table graphs.
