Calculator OSX App VS OpalCalc

TheTimeCalculator.org - The time calculator helps you either add/subtract times in hours, minutes, and seconds to a given date.

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 .

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.

Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.

Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.

Calculatored - Calculatored presents the variety of calculation tools. Whether you are a Student, Teacher or a Businessmen you can find the best tool for your requirement.