<s>
ProFTPD	B-Language
(	O
short	O
for	O
Pro	O
FTP	B-Protocol
daemon	B-Operating_System
)	O
is	O
an	O
FTP	B-Protocol
server	I-Protocol
.	O
</s>
<s>
ProFTPD	B-Language
is	O
Free	B-License
and	I-License
open-source	I-License
software	I-License
,	O
compatible	O
with	O
Unix-like	B-Operating_System
systems	I-Operating_System
and	O
Microsoft	B-Application
Windows	I-Application
(	O
via	O
Cygwin	B-Language
)	O
.	O
</s>
<s>
Along	O
with	O
vsftpd	O
and	O
Pure-FTPd	B-Language
,	O
ProFTPD	B-Language
is	O
among	O
the	O
most	O
popular	O
FTP	B-Protocol
servers	I-Protocol
in	O
Unix-like	B-Operating_System
environments	O
today	O
.	O
</s>
<s>
on	O
simplicity	O
,	O
speed	O
or	O
security	O
,	O
ProFTPD	B-Language
's	O
primary	O
design	O
goal	O
is	O
to	O
be	O
a	O
highly	O
feature	O
rich	O
FTP	B-Protocol
server	I-Protocol
,	O
exposing	O
a	O
large	O
amount	O
of	O
configuration	O
options	O
to	O
the	O
user	O
.	O
</s>
<s>
ProFTPD	B-Language
includes	O
a	O
number	O
of	O
options	O
that	O
are	O
not	O
available	O
with	O
many	O
other	O
FTP	B-Protocol
daemons	B-Operating_System
.	O
</s>
<s>
The	O
configuration	O
of	O
ProFTPD	B-Language
is	O
performed	O
in	O
a	O
single	O
main	O
configuration	O
file	O
called	O
/etc/proftpd/proftpd.conf	O
.	O
</s>
<s>
Due	O
to	O
its	O
similarities	O
to	O
the	O
configuration	O
file	O
of	O
Apache	B-Application
HTTP	I-Application
Server	I-Application
it	O
is	O
intuitively	O
understandable	O
to	O
someone	O
who	O
uses	O
this	O
popular	O
web	O
server	O
.	O
</s>
<s>
ProFTPD	B-Language
comes	O
with	O
a	O
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
only	O
,	O
but	O
there	O
are	O
several	O
third-party	O
Graphical	B-Application
user	I-Application
interfaces	I-Application
(	O
GUI	B-Application
)	O
existing	O
for	O
ProFTP	O
for	O
users	O
who	O
prefer	O
this	O
to	O
the	O
CLI	O
,	O
or	O
like	O
to	O
use	O
a	O
combination	O
of	O
both	O
.	O
</s>
<s>
Especially	O
when	O
it	O
comes	O
for	O
example	O
to	O
real-time	O
monitoring	O
of	O
current	O
user	O
actions	O
and	O
file	O
transmissions	O
,	O
a	O
GUI	B-Application
can	O
be	O
very	O
helpful	O
and	O
superior	O
to	O
the	O
CLI	O
.	O
</s>
<s>
Some	O
existing	O
GUIs	B-Application
for	O
ProFTPD	B-Language
are	O
(	O
selection	O
)	O
:	O
</s>
