1)   Sicyon Lite calculator 4.0
Sicyon = scientific (VBScript/JScript) calculator + matrix operations + constant database + units converter + solver + curve-fit.
expression calculator, VBScript, JScript, database, units converter, solver, curve fit,

 2)   CalculatorX 1. 2. 6688
CalculatorX is an enhanced expression calculator. It supports common operations, constants,built-in and custom functions, variables and note-lines. You can even use Binary, Octal, Decimal and HEXadecimal numbers in one expression to evaluate as well.
Enhanced Expression Calculator, scientific calculator, expression calculator, CalculatorX, custom function, Scientific notation, Base-N, evaluate, expression parsing, formulas,

 3)   Modern Calculator 1.7
Modern Calculator is a beautiful advanced alternative replacement for the standard Windows calculator.
Modern Calculator, the calculator, advanced calculator, scientific, log, expression calculator, grapher, plotter, arithmetic mean, history of calculations,