<s>
OpenTK	B-Application
,	O
also	O
known	O
as	O
The	O
Open	O
Toolkit	O
library	O
,	O
is	O
a	O
C#	B-Application
graphics	O
library	O
superseding	O
the	O
Tao	B-Application
Framework	I-Application
.	O
</s>
<s>
It	O
provides	O
access	O
to	O
graphics	O
tools	O
contained	O
in	O
OpenGL	B-Application
,	O
OpenCL	B-Application
,	O
and	O
OpenAL	B-Application
to	O
a	O
variety	O
of	O
CLR-based	O
languages	O
(	O
C#	B-Application
,	O
F#	B-Operating_System
,	O
etc	O
.	O
)	O
.	O
</s>
<s>
Particularly	O
,	O
it	O
is	O
usable	O
with	O
any	O
language	O
utilizing	O
either	O
of	O
the	O
.NET	B-Application
Framework	I-Application
or	O
Mono	B-Application
frameworks	I-Application
for	O
versions	O
prior	O
to	O
4.0	O
and	O
.NET	B-Application
Core	I-Application
3.1	I-Application
and	O
up	O
,	O
continuing	O
with	O
.NET	B-Application
5	I-Application
,	O
for	O
major	O
version	O
4	O
.	O
</s>
