SymPy Gamma

SymPy:

plot ([x,x**2,x**3,x**4])

$\mathrm{Plot~}\left[ x, \ x^{2}, \ x^{3}, \ x^{4}\right]$

Plot:

plot([x, x**2, x**3, x**4])

See what Wolfram|Alpha has to say.

Experiment with SymPy at SymPy Live.