SAGE plotting
Here are some python plotting engines/libraries:
- older/not python dedicated:
Grace: http://www.idyll.org/~n8gray/code PGPLOT: http://efault.net/npat/hacks/ppgplot PLplot: http://www.plplot.org
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.