Software for 3D graphing complex functions? (I am new to this forum.)
I am interesting in seeing what some equations look like when they are plotted 3-dimentionally, with one axis real numbers, the second axis imaginary numbers (thus the complex plane), and the third axis real numbers.  Is such software available either online or free-downloadable?
Thank you. 

Mathematica wouldn't be your worst option, but it will cost you a fair bit unless you're a student. You won't find anything as fully featured as Mathematica for free, but there are free alternatives that will at least be able to do what you need them to. 
I would google free Mathematica alternatives and pick one that sounds like it will work for you.
