mathematics
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SMath Studio - is a math program with 'paper'-like interface and numerous computing features. It has an ability to work with systems, matrices, vectors, complex numbers, infinities and fractions. SMath Studio supports 18-th interface languages, has versions for Windows, Windows Mobile (PPC, communicators and Smartphones) and Linux. It also includes integrated mathematical reference book. Support of the following operations and functions: addition, subtraction, multiplication (scalar and vector), division, finding of factorial, raising to power, roots, determination of modules, trigonometric functions, inverse trigonometric functions, hyperbolic and inverse hyperbolic functions, logarithms, determination of signature, calculation of an argument, determinants of matrices, transposition of matrices and vectors, minors of matrices, algebraic additions to matrices, calculations of matrix trace, ranking, conversion of complex numbers from algebraic to trigonometric form;
SMath Studio - official web site
Number Pyramid ::
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SpeedCrunch is a fast, high precision and powerful desktop calculator. Available for Linux , Microsoft Windows , and Apple Mac OS X .
fast and usable calculator
Devlin's Angle, by Keith Devlin
Mathematician Keith Devlin is the Executive Director of the Human-Sciences and Technologies Advanced Research Institute ( H-STAR ) at Stanford University and The Math Guy on NPR's Weekend Edition .