<s>
Atomistix	B-Application
ToolKit	I-Application
(	O
ATK	O
)	O
is	O
a	O
commercial	O
software	O
for	O
atomic-scale	O
modeling	B-Application
and	O
simulation	O
of	O
nanosystems	O
.	O
</s>
<s>
Atomistix	B-Application
ToolKit	I-Application
is	O
a	O
further	O
development	O
of	O
TranSIESTA-C	O
,	O
which	O
in	O
turn	O
in	O
based	O
on	O
the	O
technology	O
,	O
models	O
,	O
and	O
algorithms	O
developed	O
in	O
the	O
academic	O
codes	O
TranSIESTA	O
,	O
and	O
McDCal	O
,	O
employing	O
localized	O
basis	O
sets	O
as	O
developed	O
in	O
SIESTA	B-Application
.	O
</s>
