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Ratiochinator is a calculator uses Chinese characters.

Financial markup calculator.

Wcalc is a very capable calculator.

PEMDAS Widget is a scientific calculator.

RPN calculator.

Totalus is a table type calculator for everyday life.

Powerful scientific and conversion calculator.

Comprehensive geometry calculator.

Geometry is a calculator which uses many of the formulas found in geometry.

EdenGraph Graphing Calculator for Mac OS X.