R has some basic visualization libraries. The graphs are overall very functional, but basic. Ex: http://www.statmethods.net/advgraphs/images/splotm.png

Alternatives like Matlab, Maple, Stata all have basically the same 'look' to their default graphing packages.

Even though Mathematica would not be the right choice for statistical processing, the graphs it produces are a step above the rest.

So depends what you're use case is.. any of the above would look good enough for an academic paper. But if you're going to be publishing these in a magazine, they probably won't cut it.