<s>
Quassel	B-Language
IRC	I-Language
,	O
or	O
Quassel	B-Language
,	O
is	O
a	O
graphical	O
,	O
distributed	O
,	O
cross-platform	B-Operating_System
IRC	B-Protocol
client	I-Protocol
,	O
introduced	O
in	O
2008	O
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
version	O
2	O
and	O
version	O
3	O
,	O
for	O
GNU	B-Operating_System
and	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
macOS	B-Application
,	O
and	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
It	O
has	O
also	O
been	O
ported	O
to	O
OS/2	O
Warp	O
due	O
to	O
its	O
cross-platform	B-Operating_System
nature	O
.	O
</s>
<s>
Since	O
the	O
release	O
of	O
Kubuntu	B-Application
9.04	O
(	O
Jaunty	O
Jackalope	O
)	O
Quassel	B-Language
is	O
Kubuntu	B-Application
's	O
default	O
IRC	B-Protocol
client	I-Protocol
.	O
</s>
<s>
Quassel	B-Language
uses	O
the	O
Qt	B-Language
application	O
framework	O
.	O
</s>
<s>
Quassel	B-Language
is	O
based	O
on	O
a	O
client	B-Operating_System
–	I-Operating_System
server	I-Operating_System
model	I-Operating_System
.	O
</s>
<s>
The	O
core	O
application	O
uses	O
a	O
LAN	O
or	O
the	O
Internet	O
to	O
connect	O
to	O
one	O
or	O
more	O
clients	O
,	O
and	O
also	O
various	O
IRC	B-Protocol
servers	O
.	O
</s>
<s>
The	O
client	O
does	O
not	O
communicate	O
with	O
the	O
IRC	B-Protocol
server	O
directly	O
;	O
it	O
does	O
so	O
through	O
the	O
core	O
.	O
</s>
<s>
This	O
way	O
,	O
the	O
connection	O
to	O
the	O
IRC	B-Protocol
network	I-Protocol
is	O
maintained	O
by	O
the	O
core	O
,	O
even	O
though	O
no	O
clients	O
are	O
using	O
it	O
.	O
</s>
<s>
A	O
monolith	O
version	O
of	O
the	O
application	O
is	O
also	O
supported	O
;	O
which	O
acts	O
like	O
a	O
normal	O
IRC	B-Protocol
client	I-Protocol
,	O
with	O
no	O
separation	O
between	O
core	O
and	O
client	O
.	O
</s>
<s>
This	O
system	O
is	O
similar	O
to	O
what	O
Irssi	B-Protocol
,	O
WeeChat	B-Device
with	O
GNU	B-Application
Screen	I-Application
,	O
and	O
Smuxi	B-Protocol
use	O
.	O
</s>
<s>
Quassel	B-Language
allows	O
simultaneous	O
connections	O
to	O
multiple	O
IRC	B-Protocol
servers	O
.	O
</s>
<s>
Quassel	B-Language
stores	O
discussion	O
history	O
in	O
either	O
a	O
PostgreSQL	B-Application
or	O
a	O
SQLite	B-Language
database	O
.	O
</s>
<s>
The	O
connection	O
between	O
the	O
client	O
and	O
the	O
core	O
can	O
be	O
encrypted	O
using	O
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
(	O
SSL	O
)	O
,	O
and	O
proxies	O
are	O
supported	O
.	O
</s>
<s>
In	O
a	O
2009	O
roundup	O
of	O
large	O
IRC	B-Protocol
clients	O
for	O
Tom	O
's	O
Hardware	O
,	O
Adam	O
Overa	O
described	O
Quassel	B-Language
as	O
being	O
"	O
fully	O
featured	O
"	O
with	O
"	O
tons	O
of	O
options	O
"	O
,	O
and	O
said	O
"	O
even	O
new	O
users	O
should	O
have	O
no	O
problem	O
connecting	O
to	O
servers	O
and	O
finding	O
channels	O
using	O
the	O
GUI	O
tools	O
for	O
server	O
presets	O
and	O
channel	O
lists.	O
"	O
</s>
