O

	Name		Country	City
1	O.C.A	Original Computer's Association
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
7	Oberon Group	Ukraine	Odessa
8	Oberon Group	Ukraine
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
15	Odin Computer Graphics Ltd	Paul McKenna
16	Odin Computer Graphics Ltd
17	Odisea Software	Spain
18	Odyssey Computing	United Kingdom
19	Ofites Informatica	Spain
20	Okoloko Engineering Software	S. Okoloku	United States
21	Old English Software	R. Bingle	United Kingdom
22	Oldrich Palenicek	Czech Republic
23	Oldsoft	Zdenek Stary	Czech Republic
24	Oleg N. Cher	Ukraine
25	Oleg Origin
26	Oleg Oursoft	Russia
27	Oleg Ziberov
28	olly_bfox
29	OLSoft Company	Russia	Ufa
30	Olympic Software	United Kingdom
31	Omega
32	Omega Games	United Kingdom
33	Omega Group	Russia	St.Petersburg
34	Omega Hackers Club	Russia	Chelyabinsk
35	Omega Hackers Group	Russia	Rostov-on-Don
36	Omega Hackers Group	Russia
37	Omega HC
38	Omega HG
39	Omega Ltd
40	Omega Software [1]	Cambridge Research
41	Omega Software [2]	United Kingdom
42	Omega Software [3]	Ireland
43	Omega Software Gfx
44	Omega Software GFX	Jan Palenicek
45	Omega Software Ltd	missing
46	Omega-Soft [1]	United Kingdom
47	Omega-Soft [2]	Germany
48	Omen Group
49	Omen Software	Wordlight Ltd
50	Omicron Projects	Spain
51	Omikron
52	Omikron Software	Czech Republic
53	Omikron Software [1]	Claus Jahn	Germany
54	Omikron Software [2]	Czech Republic
55	Omikron-Software	Germany
56	OMK
57	OMK Software S.L.	Spain
58	Omni Software	United Kingdom
59	Omnisoft	United Kingdom
60	Omycron
61	Omycron Software	Portugal
62	ON6LJ Software	United Kingdom
63	One Week Productions	United Kingdom
64	Oni Records	United Kingdom
65	Online PLC	United Kingdom
66	Online PLC
67	Onspec Software	United Kingdom
68	OOPS	Russia	Odintsovo
69	OpalSoft	United Kingdom
70	Opera
71	Opera Soft	Spain
72	Opera Soft S.A.	Spain
73	Optical Bros.
74	Optical Brothers	Belarus	Minsk
75	Optical Brothers	Belarus
76	Optical Illusions	United Kingdom
77	Optimal Group	Russia
78	Optimal Group	Russia
79	Optimus Software	United Kingdom
80	Options International	United Kingdom
81	Orange Enterprizes	United Kingdom
82	Orange Software	United Kingdom
83	Orbis Publishing Ltd	United Kingdom
84	Organizm
85	Origin Systems Inc	United States
86	Original Computer Association	Russia
87	Original Computer's Association
88	Original Computers Associaton	Russia
89	Original Soft	Italy
90	Orijon Software	Germany
91	Orin Soft	Czech Republic
92	Orion [1]	Illusion Dreams	Russia
93	Orion [2]	Poland
94	Orion [3]	Portugal
95	Orion Data Ltd	United Kingdom
96	Orion Group	Russia	Krasnouralsk
97	ORION SOFTWARE	Russia	Perm
98	Orion Software [1]	United Kingdom
99	Orion Software [2]	Czech Republic
100	Orion Software [ru]
101	Orion Software Group
102	Orionsoft	Spain
103	Orpheus Ltd	United Kingdom
104	Orwin Software	Michael Orwin
105	Oscar & Spilberg
106	Oscar & Spilberg
107	Oscar Soft	Spain
108	Oscar Systems	United Kingdom
109	osh Group	Russia
110	OSM Co Ltd	Belarus	Minsk
111	OSSoft	United Kingdom
112	Outland Corp	Outland Corporation	Moldova	Chișinău
113	Outland Corporation	Moldova	Chișinău
114	Outlaw	Palace Video Group
115	Outlet	missing
116	Outlet	United Kingdom
117	Outsiders
118	Overfile Software	Russia	Kirov
119	OverPower Soft	Russia	Sarapul
120	Oversun Frendship	Russia	Severodvinsk
121	ovich
122	Oxbridge Technology Ltd	United Kingdom
123	Oxford Computer Publications Ltd
124	Oxford Computer Publishing	Oxford Computer Publications Ltd
125	Oxford Computer Publishing	United Kingdom
126	Oxford Computer Systems	United Kingdom
127	Oxford Digital Enterprises
128	Oxford Digital Enterprises	Empire Interactive
129	Oxford Mobius	Nigel Lea	United Kingdom
130	Oxford Software Group	United Kingdom
131	Oxford Technologies	United Kingdom
132	Oxford Technologies	United Kingdom
133	Oxygen Software	United Kingdom
134	Oz Software	United Kingdom
135	Ozero Ltd	Russia	Novosibirsk
136	Орион