<s>
Pure-FTPd	B-Language
is	O
a	O
free	O
(	O
BSD	B-Operating_System
license	I-Operating_System
)	O
FTP	B-Protocol
Server	I-Protocol
with	O
a	O
strong	O
focus	O
on	O
software	O
security	O
.	O
</s>
<s>
It	O
can	O
be	O
compiled	O
and	O
run	O
on	O
a	O
variety	O
of	O
Unix-like	B-Operating_System
computer	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
including	O
Linux	B-Application
,	O
OpenBSD	B-Operating_System
,	O
NetBSD	B-Device
,	O
FreeBSD	B-Operating_System
,	O
DragonFly	B-Application
BSD	I-Application
,	O
Solaris	B-Application
,	O
Tru64	B-Operating_System
,	O
Darwin	B-Operating_System
,	O
Irix	B-Operating_System
and	O
HP-UX	B-Application
.	O
</s>
<s>
It	O
has	O
also	O
been	O
ported	O
to	O
Android	B-Application
.	O
</s>
<s>
Pure-FTPd	B-Language
is	O
based	O
on	O
Troll-FTPd	O
,	O
written	O
by	O
Arnt	O
Gulbrandsen	O
while	O
he	O
was	O
working	O
at	O
Trolltech	O
from	O
1995	O
to	O
1999	O
.	O
</s>
<s>
When	O
Gulbrandsen	O
stopped	O
maintaining	O
Troll-FTPd	O
,	O
Frank	O
Denis	O
created	O
Pure-FTPd	B-Language
in	O
2001	O
,	O
and	O
it	O
is	O
currently	O
developed	O
by	O
a	O
team	O
led	O
by	O
Denis	O
.	O
</s>
