SDP (Scientific Data Processor) - Version 3.0 SDP will do your scientific chores for you , you just type in your question (with any function , units of measure and even complex numbers) almost the same way it is written in the textbook (or in your mind) and SDP does the rest. convert the units , draws the graph, find roots of your equation , does complex number calculation . It saves you both time and you don't have to worry about mistakes , as all the work is done by SDP. And if you need a constant , SDP has them all , a clickable periodic table and constants list. you can even draw graphs and generate random numbers with any distribution , do regression calculations (graph fitting) and error estimation ("(2ñ0.1)*(3.1ñ0.02)") . That is not all , download to see what there is more.