<s>
OpenProcurement	B-Operating_System
is	O
an	O
open	B-Application
source	I-Application
procurement	B-Application
software	I-Application
toolkit	O
that	O
automates	O
procurement	O
processes	O
.	O
</s>
<s>
OpenProcurement	B-Operating_System
toolkit	O
was	O
first	O
released	O
in	O
2014	O
under	O
Apache	B-Application
license	I-Application
for	O
free	O
and	O
open	B-Application
source	I-Application
software	I-Application
.	O
</s>
<s>
Originally	O
OpenProcurement	B-Operating_System
had	O
been	O
developed	O
by	O
Quintagroup	O
for	O
ProZorro	O
,	O
a	O
procurement	O
system	O
implemented	O
to	O
provide	O
transparent	O
and	O
efficient	O
spending	O
of	O
public	O
funds	O
in	O
Ukraine	O
.	O
</s>
<s>
The	O
aim	O
of	O
the	O
project	O
was	O
to	O
create	O
an	O
effective	O
electronic	O
public	O
procurement	O
system	O
with	O
open	B-Application
source	I-Application
,	O
which	O
would	O
meet	O
the	O
following	O
requirements	O
:	O
</s>
<s>
The	O
OpenProcurement	B-Operating_System
software	O
package	O
uses	O
a	O
number	O
of	O
other	O
open	B-Application
source	I-Application
products	O
:	O
</s>
<s>
OpenProcurement	B-Operating_System
consists	O
of	O
a	O
Centralized	O
database	O
(	O
CDB	O
)	O
and	O
the	O
API	O
through	O
which	O
specialized	O
electronic	O
platforms	O
can	O
interact	O
with	O
the	O
CDB	O
and	O
module	O
auctions	O
.	O
</s>
<s>
Third-party	O
web	O
platforms	O
(	O
web	O
platforms	O
,	O
which	O
implement	O
components	O
of	O
the	O
e-procurement	O
system	O
,	O
and	O
give	O
access	O
to	O
purchasing	O
organizations	O
,	O
vendors	O
,	O
and	O
ordinary	O
visitors	O
)	O
interact	O
with	O
CDB	O
using	O
OpenProcurement	B-Operating_System
API	O
and	O
provide	O
temporary	O
login	O
data	O
to	O
access	O
the	O
Module	O
of	O
the	O
auction	O
and	O
participate	O
in	O
it	O
.	O
</s>
<s>
The	O
interaction	O
between	O
web	O
sites	O
and	O
CDB	O
is	O
via	O
API	O
—	O
a	O
web	O
interface	O
based	O
on	O
the	O
module	O
JSON	B-General_Concept
.	O
</s>
<s>
The	O
business	O
logic	O
is	O
implemented	O
in	O
Python	B-Language
.	O
</s>
<s>
For	O
saving	O
the	O
auctions	O
,	O
offers	O
,	O
etc.	O
,	O
a	O
non-relational	O
database	O
CouchDB	B-Application
was	O
used	O
.	O
</s>
<s>
are	O
stored	O
on	O
the	O
file	O
server	O
,	O
which	O
is	O
compatible	O
with	O
Amazon	B-General_Concept
S3	I-General_Concept
.	O
</s>
<s>
The	O
OpenProcurement	B-Operating_System
functionality	O
is	O
suitable	O
for	O
both	O
public	O
and	O
commercial	O
procurement	O
.	O
</s>
<s>
OpenProcurement	B-Operating_System
toolkit	O
was	O
designed	O
specifically	O
for	O
the	O
Prozorro	O
,	O
the	O
Ukrainian	O
electronic	O
Government	O
procurement	O
system	O
.	O
</s>
<s>
OpenProcurement	B-Operating_System
toolkit	O
was	O
used	O
by	O
Prozorro.sale	O
,	O
a	O
Deposit	O
Guarantee	O
Fund	O
(	O
DGF	O
)	O
system	O
that	O
organizes	O
sale	O
of	O
the	O
assets	O
belonging	O
to	O
insolvent	O
or	O
liquidated	O
banks	O
.	O
</s>
<s>
Atreus	O
is	O
a	O
SaaS	O
auction	O
platform	O
that	O
has	O
in	O
its	O
core	O
an	O
OpenProcurement	B-Operating_System
toolkit	O
.	O
</s>
<s>
In	O
addition	O
to	O
ProZorro	O
and	O
ProZorro.Sale	O
,	O
the	O
OpenProcurement	B-Operating_System
software	O
package	O
was	O
also	O
implemented	O
in	O
the	O
RIALTO	O
project	O
-	O
a	O
platform	O
for	O
commercial	O
procurement	O
.	O
</s>
<s>
OpenProcurement	B-Operating_System
toolkit	O
used	O
a	O
number	O
of	O
other	O
open	B-Application
source	I-Application
projects	O
:	O
Python	B-Language
,	O
Pyramid	O
,	O
AngularJS	B-Application
,	O
Bootstrap	O
,	O
Flask	B-Language
,	O
CouchDB	B-Application
,	O
PouchDB	O
.	O
</s>
