MITCalc - Buckling Calculation 

Calculation of the optimum cross-section of slender struts strained for buckling and strength check calculation according to Johnson, Tetmajer, Euler and Secant method. Simple definition of the strut type - 40 types of predefined cross sections.
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Kalkulator 

Advanced Sci/Eng calculator. Expression evaluation, 18 digits precision, variables, 100 functions, graphs, unit conversion, interpolation, polynomial regression, linear algebra, systems of linear, nonlinear and differential equations, optimization.
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Universal Scientific Calculator 

Math Functions, factorization, financal, average, regression, factorial, dates, complexes, charts, units converter, ephemerids, Euler, Simson, gravitation. Fourier Series, Pi, Solar System, many games, Molar Mass, Taylor, Bernoulli, Gamma...
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