<s>
FileZilla	B-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
,	O
cross-platform	B-Operating_System
FTP	B-Protocol
application	O
,	O
consisting	O
of	O
FileZilla	B-Application
Client	I-Application
and	O
FileZilla	B-Application
Server	I-Application
.	O
</s>
<s>
Clients	O
are	O
available	O
for	O
Windows	B-Application
,	O
Linux	B-Application
,	O
and	O
macOS	B-Application
.	O
</s>
<s>
Both	O
server	O
and	O
client	O
support	O
FTP	B-Protocol
and	O
FTPS	B-Protocol
(	O
FTP	B-Protocol
over	O
SSL/TLS	B-Protocol
)	O
,	O
while	O
the	O
client	O
can	O
in	O
addition	O
connect	O
to	O
SFTP	B-Protocol
servers	O
.	O
</s>
<s>
FileZilla	B-Application
's	O
source	O
code	O
is	O
hosted	O
on	O
SourceForge	B-Application
and	O
the	O
project	O
was	O
featured	O
as	O
Project	O
of	O
the	O
Month	O
in	O
November	O
2003	O
.	O
</s>
<s>
FileZilla	B-Application
was	O
started	O
as	O
a	O
computer	B-General_Concept
science	I-General_Concept
class	O
project	O
in	O
the	O
second	O
week	O
of	O
January	O
2001	O
by	O
Tim	O
Kosse	O
and	O
two	O
classmates	O
.	O
</s>
<s>
They	O
decided	O
to	O
make	O
FileZilla	B-Application
an	O
open-source	B-Application
project	O
because	O
many	O
FTP	B-Protocol
clients	I-Protocol
were	O
already	O
available	O
,	O
and	O
they	O
did	O
n't	O
think	O
that	O
they	O
would	O
sell	O
a	O
single	O
copy	O
if	O
they	O
made	O
FileZilla	B-Application
commercial	O
.	O
</s>
<s>
Since	O
its	O
initial	O
development	O
in	O
2001	O
,	O
FileZilla	B-Application
has	O
been	O
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
.	O
</s>
<s>
The	O
FileZilla	B-Application
client	I-Application
is	O
currently	O
released	O
under	O
GPL-2.0-or-later	B-License
,	O
and	O
the	O
server	O
package	O
under	O
AGPL-3.0-or-later	B-Application
.	O
</s>
<s>
These	O
are	O
some	O
features	O
of	O
FileZilla	B-Application
Client	I-Application
:	O
</s>
<s>
Transfer	O
files	O
using	O
FTP	B-Protocol
and	O
encrypted	O
FTP	B-Protocol
such	O
as	O
FTPS	B-Protocol
(	O
server	O
and	O
client	O
)	O
and	O
SFTP	B-Protocol
.	O
</s>
<s>
Cross-platform	B-Operating_System
.	O
</s>
<s>
These	O
are	O
some	O
features	O
of	O
FileZilla	B-Application
Server	I-Application
:	O
</s>
<s>
In	O
May	O
2008	O
,	O
Chris	O
Foresman	O
assessed	O
FTP	B-Protocol
clients	I-Protocol
for	O
Ars	O
Technica	O
,	O
saying	O
of	O
FileZilla	B-Application
:	O
"	O
Some	O
friends	O
in	O
the	O
tech	O
support	O
world	O
often	O
recommend	O
the	O
free	B-License
and	I-License
open-source	I-License
FileZilla	B-Application
,	O
which	O
offers	O
a	O
Mac	B-Application
OS	I-Application
X	I-Application
version	O
in	O
addition	O
to	O
Windows	B-Application
and	O
Linux	B-Application
.	O
</s>
<s>
Writing	O
for	O
Ars	O
Technica	O
in	O
August	O
2008	O
Emil	O
Protalinski	O
said	O
:	O
"	O
this	O
week	O
's	O
free	B-Application
,	O
third-party	O
application	O
recommendation	O
is	O
FileZilla	B-Application
....	O
</s>
<s>
This	O
FTP	B-Protocol
client	I-Protocol
is	O
very	O
quick	O
and	O
is	O
regularly	O
updated	O
.	O
</s>
<s>
It	O
may	O
not	O
have	O
a	O
beautiful	O
GUI	B-Application
,	O
but	O
it	O
certainly	O
is	O
fast	O
and	O
has	O
never	O
let	O
me	O
down.	O
"	O
</s>
<s>
Go	O
Daddy	O
,	O
Clarion	O
University	O
of	O
Pennsylvania	O
and	O
National	O
Capital	O
FreeNet	O
recommend	O
FileZilla	B-Application
for	O
uploading	O
files	O
to	O
their	O
web	O
hosting	O
services	O
.	O
</s>
<s>
FileZilla	B-Application
is	O
available	O
in	O
the	O
repositories	O
of	O
many	O
Linux	B-Application
distributions	I-Application
,	O
including	O
Debian	O
,	O
Ubuntu	B-Operating_System
,	O
Trisquel	B-Application
and	O
Parabola	O
GNU/Linux	B-Application
-libre	O
.	O
</s>
<s>
In	O
January	O
2012	O
,	O
CNET	O
gave	O
FileZilla	B-Application
their	O
highest	O
rating	O
of	O
"	O
spectacular	O
"	O
—	O
five	O
out	O
of	O
five	O
stars	O
.	O
</s>
<s>
FileZilla	B-Application
is	O
regularly	O
listed	O
in	O
articles	O
on	O
the	O
top	O
free	B-Application
software	I-Application
applications	O
.	O
</s>
<s>
Since	O
the	O
project	O
's	O
participation	O
in	O
SourceForge	B-Application
's	O
program	O
to	O
create	O
revenue	O
by	O
adware	O
,	O
several	O
reviewers	O
started	O
warning	O
about	O
downloading	O
FileZilla	B-Application
and	O
discouraged	O
users	O
from	O
using	O
it	O
.	O
</s>
<s>
In	O
2013	O
the	O
project	O
's	O
hosting	O
site	O
,	O
SourceForge.net,	O
provided	O
the	O
main	O
download	O
of	O
FileZilla	B-Application
with	O
a	O
download	B-Protocol
wrapper	I-Protocol
,	O
"	O
offering	O
"	O
additional	O
software	O
for	O
the	O
user	O
to	O
install	O
.	O
</s>
<s>
Among	O
the	O
reported	O
effects	O
are	O
:	O
web	O
browser	O
being	O
hijacked	O
,	O
with	O
content	O
,	O
start	O
page	O
and	O
search	O
engines	O
being	O
forcibly	O
changed	O
,	O
popup	O
windows	B-Application
,	O
privacy	O
or	O
spying	O
issues	O
,	O
sudden	O
shutdown	O
and	O
restart	O
events	O
possibly	O
leading	O
to	O
loss	O
of	O
current	O
work	O
.	O
</s>
<s>
The	O
FileZilla	B-Application
webpage	O
offers	O
additional	O
download	O
options	O
without	O
adware	O
installs	O
,	O
but	O
the	O
link	O
to	O
the	O
adware	O
download	O
appears	O
as	O
the	O
primary	O
link	O
,	O
highlighted	O
and	O
marked	O
as	O
"	O
recommended	O
"	O
.	O
</s>
<s>
As	O
of	O
2016	O
,	O
FileZilla	B-Application
displays	O
ads	O
(	O
called	O
sponsored	O
updates	O
)	O
when	O
starting	O
the	O
application	O
.	O
</s>
<s>
In	O
2018	O
,	O
a	O
further	O
controversy	O
about	O
FileZilla	B-Application
's	O
use	O
of	O
a	O
bundled	O
adware	O
installer	O
caused	O
concern	O
.	O
</s>
<s>
Until	O
version	O
3.26	O
FileZilla	B-Application
stored	O
all	O
saved	O
usernames	O
and	O
passwords	O
as	O
plain	O
text	O
,	O
allowing	O
any	O
malware	O
that	O
had	O
gained	O
even	O
limited	O
access	O
to	O
the	O
user	O
's	O
system	O
to	O
read	O
the	O
data	O
.	O
</s>
<s>
FileZilla	B-Application
author	O
Tim	O
Kosse	O
was	O
reluctant	O
to	O
add	O
encrypted	O
storage	O
.	O
</s>
<s>
A	O
fork	B-Application
called	O
FileZilla	B-Application
Secure	O
was	O
started	O
in	O
November	O
2016	O
to	O
add	O
encrypted	O
storage	O
.	O
</s>
<s>
FileZilla	B-Application
Server	I-Application
is	O
a	O
sister	O
product	O
to	O
FileZilla	B-Application
Client	I-Application
.	O
</s>
<s>
It	O
is	O
an	O
FTP	B-Protocol
server	I-Protocol
supported	O
by	O
the	O
same	O
project	O
and	O
features	O
support	O
for	O
FTP	B-Protocol
and	O
FTP	B-Protocol
over	O
SSL/TLS	B-Protocol
.	O
</s>
<s>
FileZilla	B-Application
Server	I-Application
is	O
currently	O
available	O
for	O
Linux	B-Application
,	O
MacOS	B-Application
and	O
Windows	B-Application
platforms	O
.	O
</s>
<s>
FileZilla	B-Application
Server	I-Application
is	O
a	O
free	B-Application
,	O
open-source	B-Application
FTP	B-Protocol
server	I-Protocol
.	O
</s>
<s>
Its	O
source	O
code	O
is	O
hosted	O
on	O
the	O
FileZilla	B-Application
Project	O
website	O
.	O
</s>
<s>
FileZilla	B-Application
Server	I-Application
supports	O
FTP	B-Protocol
and	O
FTPS	B-Protocol
(	O
FTP	B-Protocol
over	O
SSL/TLS	B-Protocol
)	O
.	O
</s>
<s>
Unlike	O
some	O
other	O
FTP	B-Protocol
clients	I-Protocol
,	O
FileZilla	B-Application
Client	I-Application
does	O
not	O
implement	O
a	O
workaround	O
for	O
an	O
error	O
in	O
the	O
IIS	B-Application
server	I-Application
which	O
causes	O
file	O
corruption	O
when	O
resuming	O
large	O
file	O
downloads	O
.	O
</s>
