1)   ZGrapher 1.4
This graphing calculator can plot y(x), x(y), polar, parametric and table-defined functions. Calculus features include obtaining derivatives, equations of tangents and normals, numerical integration, regression analysis.

 2)   DreamCalc Graphing Calculator 3.4.0
DreamCalc is a software application which provides a fully featured and convenient alternative to using a separate hand-held graphing calculator when you are working on your PC. Because it is software, it runs alongside your other applications.

 3)   DreamCalc Financial Calculator (Pro) 3.4.0
DreamCalc Pro is a software application which provides a fully featured and convenient alternative to using a separate hand-held financial calculator when you are working on your PC. Because it is software, it runs alongside your other applications.

 4)   ZigZag 1.1
ZigZag is a handy tool to plot and explore math functions. It can plot Cartesian (Y(x) and X(y)), polar, parametric and also table-defined graphs