KCalc Alternatives

KCalc

KCalc has everything you would expect from a scientific calculator, plus:

Trigonometric functions, logic operations and statistical calculations.
A results stack which enables convenient recall of previous calculation results.
Precision is user-definable.
The display allows cut and paste of numbers.
The display colors and font are configurable, aiding usability.
The use of key-bindings make it easy to use without a pointing device.