| ID | Name | Type |
|---|---|---|
| #18544 | Olli Hihnalla | + |
| #21770 | Oloturia | P |
| #17585 | Oltrosoft | S |
| #10557 | Olympic Software | Z |
| #10559 | Omega Boek | ? |
| #10560 | Omega Games | Z |
| #19136 | Omega Group | U |
| #10561 | Omega Hackers Group | Z |
| #10562 | Omega Software GFX | Z |
| #10563 | Omega Software Ltd | Z |
| #10564 | Omega Software [1] | M |
| #10565 | Omega Software [2] | Z |
| #10566 | Omega Software [IE] | Z |
| #10568 | Omega-Soft [DE] | Z |
| #10567 | Omega-Soft [UK] | Z |
| #10569 | Omen Software | Z |
| #10570 | Omicron Projects | Z |
| #10571 | Omikron | ? |
| #10572 | Omikron Software [1] | Z |
| #10573 | Omikron Software [2] | Z |