O

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