<s>
Lightweight	B-Language
programming	I-Language
languages	I-Language
are	O
designed	O
to	O
have	O
small	O
memory	O
footprint	O
,	O
are	O
easy	O
to	O
implement	O
(	O
important	O
when	O
porting	O
a	O
language	O
to	O
different	O
computer	O
systems	O
)	O
,	O
and/or	O
have	O
minimalist	B-Device
syntax	O
and	O
features	O
.	O
</s>
<s>
Some	O
lightweight	B-Language
languages	I-Language
(	O
for	O
example	O
Lisp	B-Language
,	O
Forth	B-Application
,	O
and	O
Tcl	B-Operating_System
)	O
are	O
so	O
simple	O
to	O
implement	O
that	O
they	O
have	O
many	O
implementations	O
(	O
dialects	O
)	O
.	O
</s>
<s>
BASIC	O
implementations	O
like	O
Tiny	B-Language
BASIC	I-Language
were	O
designed	O
to	O
be	O
lightweight	O
so	O
that	O
they	O
could	O
run	O
on	O
the	O
microcomputers	B-Architecture
of	O
the	O
1980s	O
,	O
because	O
of	O
memory	O
constraints	O
.	O
</s>
<s>
Forth	B-Application
is	O
a	O
stack-based	O
concatenative	O
imperative	O
programming	O
language	O
using	O
reverse	B-Application
polish	I-Application
notation	O
.	O
</s>
<s>
Brainfuck	B-Language
is	O
an	O
extremely	O
minimalist	B-Device
esoteric	O
programming	O
language	O
.	O
</s>
<s>
Io	B-Application
is	O
a	O
prototype-based	O
object-oriented	O
scripting	B-Language
language	I-Language
.	O
</s>
<s>
Lisp-like	O
languages	O
are	O
very	O
simple	O
to	O
implement	O
,	O
so	O
there	O
are	O
many	O
lightweight	O
implementations	O
of	O
it	O
.	O
</s>
<s>
Derivatives	O
of	O
Lisp	B-Language
:	O
</s>
<s>
Tcl-like	O
languages	O
can	O
be	O
easily	O
implemented	O
because	O
of	O
its	O
simple	O
syntax	O
.	O
</s>
<s>
Tcl	B-Operating_System
itself	O
maybe	O
not	O
so	O
lightweight	O
,	O
but	O
there	O
exists	O
some	O
,	O
if	O
not	O
many	O
,	O
lightweight	O
implementations	O
of	O
languages	O
which	O
have	O
Tcl-like	O
syntax	O
.	O
</s>
<s>
There	O
are	O
many	O
embeddable	O
implementation	O
of	O
ECMAScript	B-Language
like	O
:	O
</s>
<s>
Derivatives	O
of	O
ECMAScript	B-Language
:	O
</s>
<s>
Lua	B-Language
is	O
a	O
small	O
(	O
C	O
source	O
is	O
approx	O
.	O
</s>
<s>
300kB	O
tarball	B-Application
,	O
as	O
of	O
version	O
5.3.5	O
)	O
,	O
portable	O
and	O
embeddable	O
scripting	B-Language
language	I-Language
(	O
with	O
LuaJIT	B-Application
as	O
a	O
JIT	O
compiler	O
improving	O
speed	O
)	O
.	O
</s>
<s>
Wren	O
is	O
a	O
small	O
,	O
fast	O
,	O
object-oriented	O
scripting	B-Language
language	I-Language
.	O
</s>
