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SAGE plotting
Here are some python plotting engines/libraries:
- Older/not python dedicated:
disipyl: http://kim.bio.upenn.edu/~pmagwene/disipyl/index.html
PLplot: http://www.plplot.org
opemath: Written by William Schelter and part of Maxima (thus also SAGE) is a TCL/Tk plotting program which allows for interactive viewing. It has no separate download page. An example is this [http://modular.math.washington.edu/home/wdj/art/saddle.png saddle]:
sage: maxima.eval("plot3d(2^(-u^2+v^2),[u,-1,1],[v,-1,1],[plot_format, openmath]);")
matplotlib: http://matplotlib.sourceforge.net
SAGE's plotting functionality is built on top of matplotlib, which is a very extensive plotting library with a user interface that is very similiar to Matlab's plotting. The interface that SAGE provides to matplotlib is very Mathematica like.
There are also several links to plotting/graphics/data visualization programs at the scipy [http://www.scipy.org/Topical_Software#head-b98ffdb309ccce4e4504a25ea75b5c806e4897b6 wiki].