1)   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.

 2)   Modern Calculator 1.3.5
Modern Calculator is a beautiful advanced alternative replacement for the standard Windows calculator.