<s>
APBS	B-Application
(	O
previously	O
also	O
Advanced	O
Poisson-Boltzmann	O
Solver	O
)	O
is	O
a	O
free	B-License
and	I-License
open-source	I-License
software	I-License
for	O
solving	O
the	O
equations	O
of	O
continuum	O
electrostatics	O
intended	O
primarily	O
for	O
the	O
large	O
biomolecular	O
systems	O
.	O
</s>
<s>
It	O
is	O
available	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
PDB2PQR	B-Application
prepares	O
the	O
protein	O
structure	O
files	O
from	O
Protein	O
Data	O
Bank	O
for	O
use	O
with	O
APBS	B-Application
.	O
</s>
