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lwty.org - worksheets or practice exercises, calculators & answer sheets to engage the grade school...
TheTimeCalculator.org - The time calculator helps you either add/subtract times in hours, minutes, and seconds to a given date.
RealCalc Scientific Calculator - RealCalc Scientific Calculator
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.
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 .
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.