<s>
Ups	B-Application
is	O
an	O
open	O
source	O
source-level	B-Application
debugger	I-Application
developed	O
in	O
the	O
late	O
1980s	O
for	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
systems	I-Operating_System
,	O
originally	O
developed	O
at	O
the	O
University	O
of	O
Kent	O
by	O
Mark	O
Russell	O
.	O
</s>
<s>
It	O
supports	O
C	B-Language
and	O
C++	B-Language
,	O
and	O
Fortran	B-Application
on	O
some	O
platforms	O
.	O
</s>
<s>
Unlike	O
more	O
popular	O
debugger	B-Application
stacks	O
for	O
modern	O
Unix	B-Application
platforms	O
,	O
ups	B-Application
is	O
completely	O
self-contained	O
—	O
not	O
merely	O
a	O
graphical	O
front-end	O
to	O
lower-level	O
debuggers	B-Application
like	O
gdb	B-Language
(	O
although	O
some	O
work	O
has	O
been	O
done	O
to	O
make	O
ups	B-Application
usable	O
in	O
that	O
way	O
)	O
.	O
</s>
<s>
The	O
ups	B-Application
user	O
interface	O
is	O
built	O
directly	O
upon	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
and	O
SunView	B-Library
,	O
i.e.	O
</s>
<s>
it	O
does	O
not	O
use	O
an	O
intermediate	O
widget	B-Library
toolkit	I-Library
such	O
as	O
Motif	B-Application
or	O
GTK+	B-Application
.	O
</s>
