NiceCalc3 Lite is an easy-to-use mobile calculator software, actually for symbian operating system and it easily used to perform the basic arithmetic operations and sufficiently comfortable to use as your cell phone calculator.
DreamCalc is the Ultimate Free Scientific Graphing Calculator for Windows. A slick math application that's so realistic, you'll never reach for your hand-held calculator again!
ESBCalc is a Freeware Windows Scientific Calculator with Infix Notation, Brackets, Scientific Functions, Memory, Paper Trail, Result History List and more. Now includes customising of the Colours used and customising how the Hints (ToolTips) appear.
eCalc is a free Windows calculator with basic and scientific functions. The calculator is designed with a high level of aesthetics, including large buttons and an easy to read display.