| ID | Name | Type |
|---|---|---|
| #10574 | Omni Software | Z |
| #17586 | Omnicron | R |
| #17587 | Omnidale | A |
| #10575 | Omnisoft | Z |
| #10576 | Omnitronix Ltd | Z |
| #22336 | Omsoft | - |
| #10577 | Omycron Software | Z |
| #17588 | Once Bytten | S |
| #19330 | Ondra Topinka | + |
| #22480 | Ondřej Kafka | + |
| #20185 | Ondřej Kárný | + |
| #10578 | Ondřej Mihula | + |
| #19286 | Ondřej Novák | + |
| #19310 | Ondřej Pavelka | + |
| #10579 | Ondřej Svatý | + |
| #15914 | One Percent Screens | Z |
| #10580 | One Week Productions | Z |
| #10581 | Oni Records | Z |
| #22144 | Oniric Factor | P |
| #10582 | Online PLC | Z |