I need to plot a 2 argument function (so I need a 3D plot) - ideally Mathematica style with nice colours for different values, which I will then use in a Latex document. I would prefer to get a vector output (i.e. EPS), so that it prints nicely. Please note that I will not display it on the screen (my app runs as a batch job).
I have used both Google Chart Tools and JFreeChart. I have very positive experience using JFreeChart, especially with what you described here. You can do whole lot of customizations, like tweaking colors, gradients, etc. I believe it handles vector output, but don't quote me on that. :)