Visualizing Files

Structure

Final Structure

The easiest option is to simply click-and-drag the structure into VESTA!

To view the final structure via Python using ASE:
from ase.io import read
from ase.visualize import view

atoms = read("CONTCAR")
view(atoms)
Alternatively, from the command-line:
ase gui CONTCAR

Forces

To view the forces and several other useful properties:
from ase.io import read
from ase.visualize import view

atoms = read("OUTCAR")
view(atoms)
Alternatively, from the command-line:
ase gui OUTCAR

Trajectory

To view an optimization trajectory using ASE:
from ase.io import read
from ase.visualize import view

atoms = read("OUTCAR", index=":")
view(atoms)
Alternatively, from the command-line:
ase gui OUTCAR

Charge Density

Click-and-drag the  CHGCAR  into VESTA. That's it!

Density of States

Using  sumo , run  sumo-dosplot  in a folder containing the  vasprun.xml .

Alternatively, in Pymatgen, do the following:
import matplotlib.pyplot as plt
from pymatgen.io.vasp import Vasprun
from pymatgen.electronic_structure.plotter import DosPlotter

sigma = 0.1 # smooth out the DOS
vr = Vasprun("vasprun.xml")

dos = vr.complete_dos
dos.densities = dos.get_smeared_densities(0.1)

x = dos.energies - dos.efermi
y = dos.get_densities()
plt.plot(x, y, color="k")
plt.xlabel("E - Ef (eV)")
plt.ylabel("DOS (a.u.)")
plt.show()