PCalc - PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody...
TheTimeCalculator.org - The time calculator helps you either add/subtract times in hours, minutes, and seconds to a given date.
Numi App - Numi is a beautiful text calculator for Mac.
Calculator-online.net - The 100% free and reliable online calculators that help you to solve any calculation-related problems and provides you with the precise measurements.
Calcbot for Apple Watch - Calculate, convert, and split tips from your wrist
SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .