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lwty.org - worksheets or practice exercises, calculators & answer sheets to engage the grade school...
RealCalc Scientific Calculator - RealCalc Scientific Calculator
Free42 - Free42, an HP-42S calculator simulator
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Calculator OSX App - Real Time.
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 .