Calcbot for Apple Watch - Calculate, convert, and split tips from your wrist
Tipping - Ridiculously quick tip calculator
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
RealCalc Scientific Calculator - RealCalc Scientific Calculator
Toothpick - Calculate your tip based on the server's gender
Console Calculator - Console Calculator is a powerful calculator with a simple console interface.