<s>
This	O
article	O
contains	O
a	O
list	O
of	O
libraries	B-Library
that	O
can	O
be	O
used	O
in	O
.NET	B-Language
languages	I-Language
.	O
</s>
<s>
These	O
languages	O
require	O
.NET	B-Application
Framework	I-Application
,	O
Mono	B-Application
,	O
or	O
.NET	B-Application
,	O
which	O
provide	O
a	O
basis	O
for	O
software	O
development	O
,	O
platform	B-Operating_System
independence	I-Operating_System
,	O
language	B-Language
interoperability	I-Language
and	O
extensive	O
framework	B-Architecture
libraries	B-Library
.	O
</s>
<s>
Standard	O
Libraries	B-Library
(	O
including	O
the	O
Base	O
Class	O
Library	O
)	O
are	O
not	O
included	O
in	O
this	O
article	O
.	O
</s>
<s>
Apps	O
created	O
with	O
.NET	B-Application
Framework	I-Application
or	O
.NET	B-Application
run	O
in	O
a	O
software	O
environment	O
known	O
as	O
the	O
Common	O
Language	O
Runtime	O
(	O
CLR	O
)	O
,	O
an	O
application	O
virtual	O
machine	O
that	O
provides	O
services	O
such	O
as	O
security	O
,	O
memory	B-General_Concept
management	I-General_Concept
,	O
and	O
exception	B-General_Concept
handling	I-General_Concept
.	O
</s>
<s>
The	O
framework	B-Architecture
includes	O
a	O
large	O
class	O
library	O
called	O
Framework	B-Library
Class	I-Library
Library	I-Library
(	O
FCL	O
)	O
.	O
</s>
<s>
Thanks	O
to	O
the	O
hosting	O
virtual	O
machine	O
,	O
different	O
.NET	B-Language
CLI-compliant	I-Language
languages	I-Language
can	O
operate	O
on	O
the	O
same	O
kind	O
of	O
data	O
structures	O
.	O
</s>
<s>
Therefore	O
,	O
all	O
CLI-compliant	O
languages	O
can	O
use	O
FCL	O
and	O
other	O
.NET	B-Application
libraries	B-Library
that	O
are	O
written	O
in	O
one	O
of	O
the	O
CLI	O
compliant	O
languages	O
.	O
</s>
<s>
When	O
the	O
source	O
code	O
of	O
a	O
CLI-compliant	O
language	O
is	O
compiled	O
,	O
the	O
compiler	O
generates	O
platform-independent	B-Operating_System
code	O
in	O
the	O
Common	O
Intermediate	O
Language	O
(	O
CIL	O
,	O
also	O
referred	O
to	O
as	O
bytecode	O
)	O
,	O
which	O
is	O
stored	O
in	O
CLI	O
assemblies	O
.	O
</s>
<s>
When	O
a	O
.NET	B-Application
app	O
runs	O
,	O
the	O
just-in-time	O
compiler	O
(	O
JIT	O
)	O
turns	O
the	O
CIL	O
code	O
into	O
platform-specific	O
machine	O
code	O
.	O
</s>
<s>
To	O
improve	O
performance	O
,	O
.NET	B-Application
Framework	I-Application
also	O
comes	O
with	O
the	O
Native	O
Image	O
Generator	O
(	O
NGEN	O
)	O
,	O
which	O
performs	O
ahead-of-time	O
compilation	O
to	O
machine	O
code	O
.	O
</s>
<s>
This	O
architecture	O
provides	O
language	B-Language
interoperability	I-Language
.	O
</s>
<s>
If	O
a	O
library	O
is	O
written	O
in	O
one	O
CLI	B-Language
language	I-Language
,	O
it	O
can	O
be	O
used	O
in	O
other	O
CLI	B-Language
languages	I-Language
.	O
</s>
<s>
Moreover	O
,	O
apps	O
that	O
consist	O
only	O
of	O
pure	O
.NET	B-Application
assemblies	O
,	O
can	O
be	O
transferred	O
to	O
any	O
platform	O
that	O
contains	O
an	O
implementation	O
of	O
CLI	O
and	O
run	O
on	O
that	O
platform	O
.	O
</s>
<s>
For	O
example	O
,	O
apps	O
written	O
using	O
.NET	B-Application
can	O
run	O
on	O
Windows	O
,	O
macOS	B-Application
,	O
and	O
various	O
versions	O
of	O
Linux	B-Application
.	O
</s>
<s>
.NET	B-Application
apps	O
or	O
their	O
libraries	B-Library
,	O
however	O
,	O
may	O
depend	O
on	O
native	O
platform	O
features	O
,	O
e.g.	O
</s>
<s>
COM	B-Application
.	O
</s>
<s>
As	O
such	O
,	O
platform	B-Operating_System
independence	I-Operating_System
of	O
.NET	B-Application
apps	O
depends	O
on	O
the	O
ability	O
to	O
transfer	O
necessary	O
native	B-Library
libraries	I-Library
to	O
target	O
platforms	O
.	O
</s>
<s>
In	O
2019	O
,	O
the	O
Windows	B-Application
Forms	I-Application
and	O
Windows	B-Device
Presentation	I-Device
Foundation	I-Device
portions	O
of	O
.NET	B-Application
Framework	I-Application
were	O
made	O
open	B-Application
source	I-Application
.	O
</s>
<s>
There	O
are	O
four	O
primary	O
.NET	B-Application
implementations	O
that	O
are	O
actively	O
developed	O
and	O
maintained	O
:	O
</s>
<s>
.NET	B-Application
Framework	I-Application
:	O
The	O
original	O
.NET	B-Application
implementation	O
that	O
has	O
existed	O
since	O
2002	O
.	O
</s>
<s>
Mono	B-Application
:	O
A	O
cross-platform	B-Operating_System
implementation	O
of	O
.NET	B-Application
Framework	I-Application
by	O
Ximian	O
,	O
introduced	O
in	O
2004	O
.	O
</s>
<s>
It	O
is	O
free	B-License
and	I-License
open-source	I-License
.	O
</s>
<s>
It	O
is	O
now	O
developed	O
by	O
Xamarin	B-Application
,	O
a	O
subsidiary	O
of	O
Microsoft	O
.	O
</s>
<s>
Universal	B-Device
Windows	I-Device
Platform	I-Device
(	O
UWP	O
)	O
:	O
An	O
implementation	O
of	O
.NET	B-Application
used	O
for	O
building	O
UWP	O
apps	O
.	O
</s>
<s>
It	O
's	O
designed	O
to	O
unify	O
development	O
for	O
different	O
targeted	O
types	O
of	O
devices	O
,	O
including	O
PCs	B-Device
,	O
tablets	O
,	O
phablets	O
,	O
phones	O
,	O
and	O
the	O
Xbox	B-Protocol
.	O
</s>
<s>
.NET	B-Application
:	O
A	O
cross-platform	B-Operating_System
re-implementation	O
of	O
.NET	B-Application
Framework	I-Application
,	O
introduced	O
in	O
2016	O
and	O
initially	O
called	O
.NET	B-Application
Core	I-Application
.	O
</s>
<s>
It	O
is	O
free	B-License
and	I-License
open-source	I-License
.	O
</s>
<s>
.NET	B-Application
superseded	O
.NET	B-Application
Framework	I-Application
with	O
the	O
release	O
of	O
.NET	B-Application
5	I-Application
.	O
</s>
<s>
Each	O
implementation	O
of	O
.NET	B-Application
includes	O
the	O
following	O
components	O
:	O
</s>
<s>
The	O
.NET	B-Application
Standard	O
is	O
a	O
set	O
of	O
common	O
APIs	B-Application
that	O
are	O
implemented	O
in	O
the	O
Base	O
Class	O
Library	O
of	O
any	O
.NET	B-Application
implementation	O
.	O
</s>
<s>
The	O
class	O
library	O
of	O
each	O
implementation	O
must	O
implement	O
the	O
.NET	B-Application
Standard	O
,	O
but	O
may	O
also	O
implement	O
additional	O
APIs	B-Application
.	O
</s>
<s>
Traditionally	O
,	O
.NET	B-Application
apps	O
targeted	O
a	O
certain	O
version	O
of	O
a	O
.NET	B-Application
implementation	O
,	O
e.g.	O
</s>
<s>
.NET	B-Application
Framework	I-Application
4.6	O
.	O
</s>
<s>
Starting	O
with	O
the	O
.NET	B-Application
Standard	O
,	O
an	O
app	O
can	O
target	O
a	O
version	O
of	O
the	O
.NET	B-Application
Standard	O
and	O
then	O
it	O
could	O
be	O
used	O
(	O
without	O
recompiling	O
)	O
by	O
any	O
implementation	O
that	O
supports	O
that	O
level	O
of	O
the	O
standard	O
.	O
</s>
<s>
This	O
enables	O
portability	O
across	O
different	O
.NET	B-Application
implementations	O
.	O
</s>
<s>
The	O
following	O
table	O
lists	O
the	O
.NET	B-Application
implementations	O
that	O
adhere	O
to	O
the	O
.NET	B-Application
Standard	O
and	O
the	O
version	O
number	O
at	O
which	O
each	O
implementation	O
became	O
compliant	O
with	O
a	O
given	O
version	O
of	O
.NET	B-Application
Standard	O
.	O
</s>
<s>
For	O
example	O
,	O
according	O
to	O
this	O
table	O
,	O
.NET	B-Application
Core	I-Application
3.0	I-Application
was	O
the	O
first	O
version	O
of	O
.NET	B-Application
Core	I-Application
that	O
adhered	O
to	O
.NET	B-Application
Standard	O
2.1	O
.	O
</s>
<s>
This	O
means	O
that	O
any	O
version	O
of	O
.NET	B-Application
Core	I-Application
bigger	O
than	O
3.0	O
(	O
e.g.	O
</s>
<s>
.NET	B-Application
Core	I-Application
3.1	I-Application
)	O
also	O
adheres	O
to	O
.NET	B-Application
Standard	O
2.1	O
.	O
</s>
<s>
ASP.NET	B-Application
a	O
server-side	O
web	B-Application
application	I-Application
framework	I-Application
designed	O
for	O
web	O
development	O
to	O
produce	O
dynamic	O
web	O
pages	O
.	O
</s>
<s>
It	O
is	O
the	O
successor	O
to	O
Microsoft	O
's	O
Active	B-General_Concept
Server	I-General_Concept
Pages	I-General_Concept
(	O
ASP	O
)	O
technology	O
built	O
on	O
the	O
Common	O
Language	O
Runtime	O
(	O
CLR	O
)	O
.	O
</s>
<s>
It	O
provides	O
separate	O
patterns	O
for	O
developing	O
web	B-Application
applications	I-Application
ASP.NET	B-Application
MVC	O
,	O
ASP.NET	B-Application
Web	O
API	B-Application
,	O
and	O
ASP.NET	B-Application
Web	I-Application
Pages	I-Application
(	O
a	O
platform	O
using	O
only	O
Razor	B-Application
pages	O
)	O
,	O
which	O
have	O
merged	O
into	O
a	O
unified	O
MVC	O
6	O
.	O
</s>
<s>
ASP.NET	B-Application
Core	I-Application
a	O
successor	O
and	O
re-implementation	O
of	O
ASP.NET	B-Application
as	O
a	O
modular	O
web	B-Application
framework	I-Application
,	O
together	O
with	O
other	O
frameworks	O
like	O
Entity	B-Application
Framework	I-Application
.	O
</s>
<s>
The	O
framework	B-Architecture
uses	O
the	O
new	O
open-source	B-Application
.NET	B-Application
Compiler	O
Platform	O
(	O
codename	O
"	O
Roslyn	O
"	O
)	O
and	O
is	O
cross	B-Operating_System
platform	I-Operating_System
.	O
</s>
<s>
Blazor	B-Operating_System
a	O
free	B-License
and	I-License
open-source	I-License
web	B-Application
framework	I-Application
that	O
enables	O
developers	O
to	O
create	O
Web	B-Application
apps	I-Application
using	O
C#	B-Application
and	O
HTML	B-Language
.	O
</s>
<s>
Blazor	B-Operating_System
Server	O
apps	O
are	O
hosted	O
on	O
an	O
ASP.NET	B-Application
Core	I-Application
server	O
in	O
ASP.NET	B-Application
Razor	I-Application
format	O
,	O
while	O
Blazor	B-Operating_System
WebAssembly	O
apps	O
are	O
Single-page	B-Application
apps	I-Application
that	O
are	O
downloaded	O
to	O
the	O
client	O
's	O
web	O
browser	O
before	O
running	O
.	O
</s>
<s>
AForge.NET	B-Application
a	O
computer	O
vision	O
and	O
artificial	O
intelligence	O
library	O
.	O
</s>
<s>
ALGLIB	B-Library
a	O
cross-platform	B-Operating_System
open	B-Application
source	I-Application
numerical	O
analysis	O
and	O
data	O
processing	O
library	O
.	O
</s>
<s>
It	O
consists	O
of	O
algorithm	O
collections	O
written	O
in	O
different	O
programming	O
languages	O
(	O
C++	O
,	O
C#	B-Application
,	O
FreePascal	O
,	O
Delphi	O
,	O
VBA	O
)	O
and	O
has	O
dual	O
licensing	O
–	O
commercial	O
and	O
GPL	B-License
.	O
</s>
<s>
Math.NET	B-Language
Numerics	I-Language
aims	O
to	O
provide	O
methods	O
and	O
algorithms	O
for	O
numerical	O
computations	O
in	O
science	O
,	O
engineering	O
and	O
every	O
day	O
use	O
.	O
</s>
<s>
MIT/X11	B-License
license	I-License
.	O
</s>
<s>
Meta.Numerics	B-Language
is	O
a	O
library	O
for	O
advanced	O
scientific	O
computation	O
in	O
the	O
.NET	B-Application
Framework	I-Application
.	O
</s>
<s>
ILNumerics.Net	B-Language
a	O
commercial	O
high	O
performance	O
,	O
typesafe	O
numerical	O
array	O
classes	O
and	O
functions	O
for	O
general	O
math	O
,	O
FFT	O
and	O
linear	O
algebra	O
,	O
aims	O
.NET/mono	O
,	O
32&64	O
bit	O
,	O
script-like	O
syntax	O
in	O
C#	B-Application
,	O
2D	O
&	O
3D	O
plot	O
controls	O
,	O
efficient	O
memory	B-General_Concept
management	I-General_Concept
.	O
</s>
<s>
Measurement	B-Application
Studio	I-Application
a	O
commercial	O
integrated	O
suite	O
UI	O
controls	O
and	O
class	O
libraries	B-Library
for	O
use	O
in	O
developing	O
test	O
and	O
measurement	O
applications	O
.	O
</s>
<s>
The	O
analysis	O
class	O
libraries	B-Library
provide	O
various	O
digital	O
signal	O
processing	O
,	O
signal	O
filtering	O
,	O
signal	O
generation	O
,	O
peak	O
detection	O
,	O
and	O
other	O
general	O
mathematical	O
functionality	O
.	O
</s>
<s>
NMath	B-Language
Commercial	O
numerical	O
component	O
libraries	B-Library
for	O
the	O
.NET	B-Application
platform	I-Application
by	O
CenterSpace	O
Software	O
,	O
including	O
signal	O
processing	O
(	O
FFT	O
)	O
classes	O
,	O
a	O
linear	O
algebra	O
(	O
LAPACK	O
&	O
BLAS	O
)	O
framework	B-Architecture
,	O
and	O
a	O
statistics	O
package	O
.	O
</s>
<s>
Open	B-Application
Toolkit	I-Application
(	O
OpenTK	B-Application
)	O
a	O
low-level	O
C#	B-Application
binding	O
for	O
OpenGL	B-Application
,	O
OpenGL	B-Application
ES	I-Application
and	O
OpenAL	B-Application
.	O
</s>
<s>
It	O
runs	O
on	O
Windows	O
,	O
Linux	B-Application
,	O
Mac	B-Application
OS	I-Application
X	O
,	O
BSD	O
,	O
Android	O
and	O
iOS	O
.	O
</s>
<s>
Windows	B-Device
Presentation	I-Device
Foundation	I-Device
(	O
WPF	O
)	O
a	O
graphical	O
subsystem	O
for	O
rendering	O
user	O
interfaces	O
,	O
developed	O
by	O
Microsoft	O
.	O
</s>
<s>
Unity	B-Application
a	O
cross-platform	B-Operating_System
game	O
engine	O
developed	O
by	O
Unity	B-Application
Technologies	O
and	O
used	O
to	O
develop	O
video	O
games	O
for	O
PC	B-Device
,	O
consoles	B-Device
,	O
mobile	B-Application
devices	I-Application
and	O
websites	O
.	O
</s>
<s>
AForge.NET	B-Application
a	O
computer	O
vision	O
and	O
artificial	O
intelligence	O
library	O
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	O
LGPLv3	B-Application
and	O
partly	O
GPLv3	O
license	O
.	O
</s>
<s>
Majority	O
of	O
the	O
library	O
is	O
written	O
in	O
C#	B-Application
and	O
thus	O
cross-platform	B-Operating_System
.	O
</s>
<s>
Functionality	O
of	O
AForge.NET	B-Application
has	O
been	O
extended	O
by	O
the	O
Accord.NET	B-Application
library	O
.	O
</s>
<s>
Accord.NET	B-Application
another	O
computer	O
vision	O
and	O
artificial	O
intelligence	O
library	O
,	O
available	O
under	O
the	O
Gnu	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
,	O
version	O
2.1	O
.	O
</s>
<s>
It	O
is	O
mainly	O
written	O
in	O
C#	B-Application
.	O
</s>
<s>
Gtk#	O
C#	B-Application
wrappers	O
around	O
the	O
underlying	O
GTK+	B-Application
and	O
GNOME	B-Application
libraries	B-Library
,	O
written	O
in	O
C	B-Language
and	O
available	O
on	O
Linux	B-Application
,	O
MacOS	B-Application
and	O
Windows	O
.	O
</s>
<s>
Windows	B-Application
Forms	I-Application
(	O
WinForms	B-Application
)	O
Microsoft	O
GUI	O
framework	B-Architecture
.	O
</s>
<s>
The	O
original	O
Microsoft	O
implementation	O
runs	O
on	O
Windows	O
operating	O
systems	O
and	O
provides	O
access	O
to	O
Windows	O
User	O
Interface	O
Common	O
Controls	O
by	O
wrapping	O
the	O
Windows	B-Library
API	I-Library
in	O
managed	O
code	O
.	O
</s>
<s>
The	O
alternative	O
Mono	B-Application
implementation	O
is	O
open	B-Application
source	I-Application
and	O
cross-platform	B-Operating_System
(	O
it	O
runs	O
on	O
Windows	O
,	O
Linux	B-Application
,	O
Unix	O
and	O
OS	O
X	O
)	O
.	O
</s>
<s>
The	O
library	O
is	O
written	O
in	O
C#	B-Application
in	O
order	O
to	O
avoid	O
Windows	O
dependence	O
.	O
</s>
<s>
At	O
the	O
Microsoft	O
Connect	O
event	O
on	O
December	O
4	O
,	O
2018	O
,	O
Microsoft	O
announced	O
releasing	O
of	O
Windows	B-Application
Forms	I-Application
as	O
open	B-Application
source	I-Application
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
Windows	B-Application
Forms	I-Application
has	O
become	O
available	O
for	O
projects	O
targeting	O
the	O
.NET	B-Application
framework	I-Application
.	O
</s>
<s>
However	O
,	O
the	O
framework	B-Architecture
is	O
still	O
available	O
only	O
on	O
Windows	O
platform	O
and	O
the	O
Mono	B-Application
incomplete	O
implementation	O
of	O
WinForms	B-Application
remains	O
the	O
only	O
cross-platform	B-Operating_System
implementation	O
.	O
</s>
<s>
Windows	B-Device
Presentation	I-Device
Foundation	I-Device
(	O
WPF	O
)	O
a	O
graphical	O
subsystem	O
for	O
rendering	O
user	O
interfaces	O
in	O
Windows-based	O
applications	O
by	O
Microsoft	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
DirectX	B-Application
and	O
employs	O
XAML	O
,	O
an	O
XML-based	O
language	O
,	O
to	O
define	O
and	O
link	O
various	O
interface	O
elements	O
.	O
</s>
<s>
At	O
the	O
Microsoft	O
Connect	O
event	O
on	O
December	O
4	O
,	O
2018	O
,	O
Microsoft	O
announced	O
releasing	O
of	O
WPF	O
as	O
open	B-Application
source	I-Application
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
Windows	B-Device
Presentation	I-Device
Foundation	I-Device
has	O
become	O
available	O
for	O
projects	O
targeting	O
the	O
.NET	B-Application
framework	I-Application
.	O
</s>
<s>
Windows	B-Language
UI	I-Language
Library	I-Language
(	O
WinUI	B-Language
)	O
a	O
set	O
of	O
Microsoft	O
UI	O
controls	O
and	O
features	O
for	O
the	O
Universal	B-Device
Windows	I-Device
Platform	I-Device
(	O
UWP	O
)	O
.	O
</s>
<s>
At	O
the	O
Microsoft	O
Connect	O
event	O
on	O
December	O
4	O
,	O
2018	O
,	O
Microsoft	O
announced	O
releasing	O
of	O
WinUI	B-Language
as	O
open	B-Application
source	I-Application
.	O
</s>
<s>
WinUI	B-Language
has	O
become	O
available	O
for	O
projects	O
targeting	O
the	O
.NET	B-Application
framework	I-Application
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
Xamarin.Forms	O
a	O
cross-platform	B-Operating_System
UI	O
toolkit	O
for	O
development	O
of	O
native	O
user	O
interfaces	O
that	O
can	O
be	O
run	O
on	O
macOS	B-Application
,	O
iOS	O
,	O
Android	O
,	O
and	O
Universal	B-Device
Windows	I-Device
Platform	I-Device
apps	O
.	O
</s>
<s>
.NET	B-Application
Multi-platform	B-Operating_System
App	O
UI	O
(	O
.NET	B-Application
MAUI	I-Application
)	O
a	O
cross-platform	B-Operating_System
UI	O
toolkit	O
announced	O
in	O
May	O
2020	O
that	O
originated	O
as	O
a	O
fork	O
of	O
Xamarin.Forms	O
and	O
that	O
can	O
run	O
on	O
Android	O
,	O
iOS	O
,	O
Linux	B-Application
,	O
macOS	B-Application
,	O
Tizen	O
,	O
and	O
Windows	O
.	O
</s>
<s>
.NET	B-Application
MAUI	I-Application
will	O
run	O
on	O
.NET	B-Application
6	I-Application
and	O
later	O
.	O
</s>
<s>
The	O
source	O
code	O
is	O
licensed	O
under	O
MIT	B-License
License	I-License
and	O
available	O
on	O
GitHub	B-Application
.	O
</s>
<s>
NUnit	B-Application
an	O
open	B-Application
source	I-Application
unit	O
testing	O
framework	B-Architecture
for	O
.NET	B-Application
,	O
written	O
in	O
C#	B-Application
and	O
thus	O
cross-platform	B-Operating_System
.	O
</s>
<s>
It	O
is	O
one	O
of	O
many	O
programs	O
in	O
the	O
xUnit	B-Library
family	O
.	O
</s>
<s>
Licensed	O
under	O
MIT	B-License
License	I-License
.	O
</s>
<s>
.NET	B-Application
Framework	I-Application
natively	O
provides	O
utilities	O
for	O
object	B-General_Concept
–	I-General_Concept
relational	I-General_Concept
mapping	I-General_Concept
through	O
ADO.NET	B-Device
,	O
a	O
part	O
of	O
.NET	B-Application
stack	O
since	O
.NET	B-Application
1.0	O
.	O
</s>
<s>
In	O
addition	O
,	O
a	O
number	O
of	O
third-party	O
object	O
–	O
relational	O
libraries	B-Library
have	O
emerged	O
,	O
especially	O
in	O
earlier	O
years	O
of	O
the	O
.NET	B-Application
development	O
,	O
in	O
order	O
to	O
fill	O
some	O
perceived	O
gaps	O
of	O
the	O
framework	B-Architecture
.	O
</s>
<s>
As	O
the	O
framework	B-Architecture
has	O
evolved	O
,	O
additional	O
object	O
–	O
relational	O
tools	O
were	O
added	O
,	O
such	O
as	O
the	O
Entity	B-Application
Framework	I-Application
included	O
with	O
the	O
.NET	B-Application
Framework	I-Application
3.5	O
.	O
</s>
<s>
LINQ	O
to	O
SQL	O
was	O
also	O
introduced	O
with	O
.NET	B-Application
3.5	O
.	O
</s>
<s>
This	O
somehow	O
reduced	O
significance	O
and	O
popularity	O
of	O
third-party	O
object	O
–	O
relational	O
libraries	B-Library
.	O
</s>
<s>
Entity	B-Application
Framework	I-Application
an	O
open	B-Application
source	I-Application
object	B-General_Concept
–	I-General_Concept
relational	I-General_Concept
mapping	I-General_Concept
(	O
ORM	O
)	O
framework	B-Architecture
for	O
ADO.NET	B-Device
.	O
</s>
<s>
It	O
was	O
a	O
part	O
of	O
.NET	B-Application
Framework	I-Application
,	O
but	O
since	O
Entity	B-Application
framework	I-Application
version	O
6	O
it	O
is	O
separated	O
from	O
.NET	B-Application
framework	I-Application
.	O
</s>
<s>
NHibernateNHibernate	O
is	O
an	O
object	O
–	O
relational	O
mapper	O
for	O
the	O
.NET	B-Application
platform	I-Application
.	O
</s>
