NaivePlot is a (yet another) library for making simple plotting in the terminal. Implemented in python it is perfect to visualize simple data, and pretty complex stuff too - but in an ascii-kinda-way.
$ python
Python 2.7.3 (default, Sep 26 2013, 20:08:41)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from math import sin, cos, pi
>>> from naiveplot import Func, ParaFunc, Curve, NaivePlot
>>>
>>> pf1 = ParaFunc(lambda t: 16*(sin(t)**3),
... lambda t: 13*cos(t) - 5*cos(2*t) - 2*cos(3*t) - cos(4*t))
>>> c1 = Curve(pf1, -pi, pi, 0.001)
>>>
>>> pf2 = Func(lambda s: s - 8*cos(0.1*s) ** 3 + 0.003*s**2)
>>> c2 = Curve(pf2, -18, 18, 0.01)
>>>
>>> heart = NaivePlot()
>>> heart.add_curve(c1, 'o')
>>> heart.add_curve(c2, 'x')
>>> heart.fit_curve(c2)
>>> print heart
NaivePlot, 79x23
| x
| xxxx
| xxxx
| xxxx
| xxxx
oooooooooooooooooo | ooooooooooooooooxxx
oooooo ooooo X ooooo xxxxoooooo
ooo oooo 8oooo xxx ooo
ooo oo7o xxx ooo
o o5 xx o
o 4 xxx o
oo 2 xxx oo
-----------------X---8-7--6-5-4-3-2-1-d+-1-2-3-4-5--6-7-8---X-----------------
ooo 2 xxx ooo
oooo 3 xxx oooo
ooooo 5 xxx ooooo
ooooo 7xxxx ooooo
ooooo xx8x ooooo
oxxxxxxxxxxxxx X ooooo
xxxxxxxxxxxxxx ooooo | ooooo
xxxxx oooo | oooo
xxxxx ooo |ooo
xxxxx oo|o
>>>