GraphCalc is described as 'all-in-one solution to everything from everyday arithmetic to statistical analysis, from betas to Booleans, from cubes to calculus, from decimals to derivatives' and is an app in the Education & Reference category. There are more than 25 alternatives to GraphCalc for a variety of platforms, including Windows, Mac, Online / Web-based, Linux and Android. The best alternative is Wolfram Alpha, which is free. Other great apps like GraphCalc are Qalculate! (Free, Open Source), Mathematica (Paid), Windows Calculator (Free, Open Source) and Desmos (Free).
Do you really need your calculator's on-screen number pad? (You know, the virtual keyboard?) Really small! Memo + Calculator! Characteristics: Because there is no number pad, the window size is very small. Auto calculate per line.
Is a powerful, easy-to-use, equation plotter with numerical and calculus features: Win32 screen shot. Graph Cartesian functions, relations, and inequalities, plus polar, parametric, and ordinary differential equations. Up to 999 graphs on screen at once.
Supercalc is an expression calculator for Windows. An expression calculator gives the user the ability to type an equation exactly as it is to be evaluated. This allows for much more intuitive use of the calculator.
Equalizer is a freeware scientific calculator. Instead of the traditional look of many buttons, Equalizer has a simple text line on which you can write the expression in the same way you'd write it on paper, and drawing graphs of equations.