Graphing Calculators
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Microsoft Mathematics has a graphing calculator that you can download for free to your computer.
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Desmos is a free online graphing calculator that you use right online and do not need to download.
Scientific Calculators
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Unlike traditional desktop calculator, SpeedCrunch is easier to use. You just type the expression that you want to calculate and press Enter. You can see clearly what you typed along with the result in the scrollable display. That is faster and more convenient, isn't it? Speed Crunch is a free scientific calculator application for Windows, Mac, and Linux operating systems. Speed Crunchperforms all of the functions necessary for high school Algebra and Geometry courses except graphing. In addition to performing all of these functions, Speed Crunch has a "math book" containing commonly used equations and formulas.
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Encalc is an online scientific calculator. Key features include the ability to handle units and dimensional analysis, to perform symbolic algebra and calculus, to define variables, and to lookup values from its large database of physical constants. Integration, differentiation, parentheses and scientific formulas are also supported.

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Web2.0calc is a free online scientific calculator.

Miscellaneous
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Calkoo is a website that offers forty-three free online calculators for a variety of functions. The list of calculators that Calkoo is divided into ten categories. Those categories are mathematics, measurement & conversion, saving & investing, capital budgeting, cost of capital, wages & taxes, financial analysis, health, loan & leasing, and stock analysis.