<s>
SerenityOS	B-Language
is	O
a	O
free	B-License
and	I-License
open	I-License
source	I-License
desktop	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
that	O
has	O
been	O
in	O
continuous	O
development	O
since	O
2018	O
.	O
</s>
<s>
Initially	O
the	O
one-man	O
project	O
of	O
Swedish	O
programmer	O
Andreas	B-Language
Kling	I-Language
,	O
SerenityOS	B-Language
is	O
now	O
developed	O
by	O
a	O
community	O
of	O
hobbyists	B-Operating_System
.	O
</s>
<s>
The	O
system	O
supports	O
the	O
x86-64	B-Device
instruction	B-General_Concept
set	I-General_Concept
,	O
features	O
a	O
preemptive	B-Algorithm
kernel	I-Algorithm
,	O
and	O
hosts	O
multiple	O
complex	O
applications	O
including	O
its	O
own	O
web	B-Application
browser	I-Application
and	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
.	O
</s>
<s>
As	O
of	O
2021	O
,	O
Kling	O
works	O
full-time	O
on	O
SerenityOS	B-Language
,	O
supported	O
by	O
community	O
donations	O
.	O
</s>
<s>
SerenityOS	B-Language
aims	O
to	O
be	O
a	O
modern	O
Unix-like	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
,	O
with	O
a	O
look	B-Application
and	I-Application
feel	I-Application
that	O
emulates	O
1990s	O
operating	B-General_Concept
systems	I-General_Concept
such	O
as	O
Microsoft	B-Application
Windows	I-Application
and	O
Mac	B-Application
OS	I-Application
.	O
</s>
<s>
The	O
web	B-Application
browser	I-Application
for	O
instance	O
,	O
does	O
not	O
use	O
a	O
preexisting	O
web	B-Protocol
engine	I-Protocol
such	O
as	O
WebKit	B-Language
,	O
instead	O
using	O
its	O
own	O
known	O
as	O
LibWeb	O
.	O
</s>
<s>
There	O
is	O
a	O
collection	O
of	O
ported	O
software	O
,	O
such	O
as	O
GCC	B-Application
,	O
Git	B-Application
and	O
Doom	B-Application
,	O
with	O
varying	O
levels	O
of	O
functionality	O
.	O
</s>
<s>
Additionally	O
,	O
no	O
binary	B-Application
distributions	I-Application
are	O
provided	O
and	O
prospects	O
are	O
expected	O
to	O
build	O
the	O
system	O
from	O
source	O
.	O
</s>
<s>
The	O
system	O
is	O
written	O
in	O
what	O
the	O
authors	O
call	O
"	O
Serenity	O
C++	B-Language
"	O
,	O
a	O
variant	O
of	O
C++	B-Language
that	O
lacks	O
exceptions	B-General_Concept
and	O
features	O
its	O
own	O
standard	B-Library
library	I-Library
.	O
</s>
<s>
The	O
relative	O
popularity	O
of	O
SerenityOS	B-Language
compared	O
to	O
other	O
hobbyist	O
systems	O
is	O
in	O
part	O
due	O
to	O
the	O
modest	O
success	O
of	O
Kling	O
's	O
YouTube	B-General_Concept
channel	I-General_Concept
,	O
where	O
he	O
uploads	O
videos	O
of	O
him	O
developing	O
parts	O
of	O
the	O
system	O
alongside	O
demos	O
and	O
monthly	O
progress	O
updates	O
.	O
</s>
<s>
Jim	O
Salter	O
of	O
Ars	O
Technica	O
regarded	O
the	O
use	O
of	O
the	O
ext2	B-Application
file	B-Application
system	I-Application
as	O
his	O
least	O
favorite	O
feature	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Compared	O
to	O
TempleOS	B-Application
(	O
another	O
operating	B-General_Concept
system	I-General_Concept
well	O
known	O
in	O
the	O
hobbyist	O
community	O
)	O
,	O
he	O
considered	O
it	O
more	O
accessible	O
.	O
</s>
<s>
For	O
less	O
technical	O
users	O
that	O
are	O
looking	O
for	O
a	O
mid	O
–	O
to	O
–	O
late	O
90s	O
reminiscent	O
visual	O
style	O
,	O
the	O
Xfce	B-Language
Chicago95	O
theme	O
or	O
the	O
Redmond	O
Project	O
has	O
been	O
recommended	O
instead	O
.	O
</s>
