TheTimeCalculator.org - The time calculator helps you either add/subtract times in hours, minutes, and seconds to a given date.
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.
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GNU Octave - GNU Octave is a programming language for scientific computing.
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 .
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