O

	Name		Country	City
1	O-Set		Russia	Gatchina
2	O.C.A	simbols	Russia	Chaykovskiy
3	O.E. Ltd		United Kingdom
4	O.I.C. Ltd		United Kingdom
5	O.Sheen Software		United Kingdom
6	O2-S soft		Russia	Saratov
7	Oasis Software		United Kingdom
8	Oberon Group		Ukraine	Odesa
9	Ocean Software Ltd	Atari Inc	United Kingdom
10	Ocean-Imagine Hellas		Greece
11	OCTA Soft		Hungary
12	Octopus Software		United Kingdom
13	odessamic
14	Odin Computer Graphics Ltd		United Kingdom
15	Odisea Software		Spain
16	Odyssey Computing		United Kingdom
17	Offence		Norway
18	Ofites Informatica		Spain
19	OI3		Spain
20	Okoloko Engineering Software		United States
21	Oktogonia
22	Old English Software		United Kingdom
23	Old Friends		Russia	Oryol
24	Oldrich Palenicek		Czech Republic
25	Oldsoft		Czech Republic
26	Oleg Oursoft		Russia
27	OLSoft Company		Russia	Ufa
28	Olympic Software		United Kingdom
29	Omega Games		United Kingdom
30	Omega Group		Russia	St.Petersburg
31	Omega Hackers Club		Russia	Chelyabinsk
32	Omega Hackers Group		Russia	Rostov-on-Don
33	Omega Ltd
34	Omega Software		Ireland
35	Omega Software		United Kingdom
36	Omega Software	Cambridge Research
37	Omega Software GFX		Czech Republic
38	Omega Software Ltd
39	Omega-Soft		Germany
40	Omega-Soft		United Kingdom
41	Omen Group
42	Omen Software	Wordlight Ltd
43	Omicron Projects		Spain
44	Omikron Software		Czech Republic
45	Omikron Software		Germany
46	OMK Software S.L.		Spain
47	Omni Software		United Kingdom
48	Omnisoft		United Kingdom
49	Omycron Software		Portugal
50	ON6LJ Software		United Kingdom
51	One Week Productions		United Kingdom
52	Oni Records		United Kingdom
53	Online PLC		United Kingdom
54	ONOsoft		Czech Republic
55	Onspec Software		United Kingdom
56	OOPS		Russia	Odintsovo
57	OpalSoft		United Kingdom
58	Opera Soft S.A.		Spain
59	Optical Brothers		Belarus	Minsk
60	Optical Illusions		United Kingdom
61	Optimal Group		Russia
62	Optimus Software		United Kingdom
63	Options International		United Kingdom
64	Orange Enterprizes		United Kingdom
65	Orange Software		United Kingdom
66	Orbis Publishing Ltd		United Kingdom
67	Orbit Data		United Kingdom
68	Origin Systems Inc		United States
69	Original Computers Association	simbols	Russia	Chaykovskiy
70	Original Soft		Italy
71	Orijon Software		Germany
72	Orin Soft		Czech Republic
73	Orion		Portugal
74	Orion		Poland
75	Orion		Russia	Krasnouralsk
76	Orion Data Ltd		United Kingdom
77	ORION Group		Ukraine	Donetsk
78	Orion Group		Russia	Chelyabinsk
79	Orion Ostrava		Czech Republic
80	Orion Software		Czech Republic
81	Orion Software		United Kingdom
82	Orion Software Group	Illusion Dreams	Russia	Yoshkar-Ola
83	Orion Software Group		Russia	Andreapol
84	Orionsoft		Spain
85	Orpheus Ltd		United Kingdom
86	Orwin Software		United Kingdom
87	Oscar & Spilberg
88	Oscar Soft		Spain
89	Oscar Systems		United Kingdom
90	osh Group		Russia
91	OSM Co Ltd		Belarus	Minsk
92	OSSoft		United Kingdom
93	OtaSoft		Czech Republic
94	Outland Corporation		Moldova	Chișinău
95	Outlaw	Palace Video Group	United Kingdom
96	Outlet		United Kingdom
97	Outsiders
98	Overfile Software		Russia	Kirov
99	OverPower Soft		Russia	Sarapul
100	Oversun Friendship		Russia	Severodvinsk
101	ovich
102	Oxbridge Technology Ltd		United Kingdom
103	Oxford Computer Publications Ltd		United Kingdom
104	Oxford Computer Publishing	Oxford Computer Publications Ltd	United Kingdom
105	Oxford Computer Systems		United Kingdom
106	Oxford Digital Enterprises	Empire Interactive
107	Oxford Mobius	Nigel Lea	United Kingdom
108	Oxford Software Group		United Kingdom
109	Oxford Technologies		United Kingdom
110	Oxygen Software		United Kingdom
111	Oz Software		United Kingdom
112	Ozero Ltd		Russia	Novosibirsk
113	Ozzyos Software		Czech Republic
114	Орион