Pretty contour plots are easy to produce in Sage.
var('x,y')
f = x^2+y^2
myplot=contour_plot(f,(x,-3,3),(y,-3,3), aspect_ratio=1,fill=False, cmap='prism', contours=range(11))
show(myplot)
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var('x,y')
f = (e^x)*cos(y)
myplot = contour_plot(f2,(x,0,6),(y,-6,6), aspect_ratio=1,fill=False, cmap='hsv', contours=range(-10,10))
show(myplot)
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var('x,y')
f = 7*x^2+2*x*y+3*y^2+5*x+11*y
myplot = contour_plot(f,(x,-2,2),(y,-5,2),aspect_ratio=1,fill=False, cmap='hsv', contours=range(-10,10))
show(myplot)
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