ULTIMATE CALCULATOR v2.4 - Graphic scientific 
calculator. Expression evaluator with many 
built-in functions, operators, numerical 
notations, and modes. Supports user variables 
& functions. Solves, and plots equations, 
does integrations and summations. Supports 
hex & binary notations. Radian & degree 
modes. 18 significant digits. Online help and 
much more.