MathMod
MathMod is a mathematical modeling software
MathMod is a portable interactive plotting and graphing program for Windows, Linux, MacOSX and many other platforms.
MathMod allows to plot 3D mathematical surfaces, described by implicit or parametric equations, and offers a very large database of model samples that can be generated with it. It's Free and Open Source.
Change-log for MathMod-11.1 (16/06/2021)
Welcome to the realm of complex numbers!
1) Support of graphing functions with complex numbers Z=u+iv in 3D and 4D spaces (demo...