| Name | Region |
|---|---|
| Detalion Games S.A. | |
| Dev and Deliver | |
| DevaGroup Sp. z o.o. Sp. k. | Lesser Poland |
| Devapo | |
| DevChain Sp. z o.o. | |
| Develia S.A. | |
| DevelopsToday | |
| Develtio Sp. z o.o. | |
| DevEnv | |
| Devils.one | |
| Deviniti | Lower Silesian |
| Devisu | |
| Devopsbay | Pomeranian |
| DevOpsBox | Masovian |
| DevPark Sp. z o.o. | |
| Devrry Integrated | |
| Devstyle.pl | |
| DevTalents Ltd | |
| dGCS.NET Sp. z o.o. | Masovian |
| dhosting.pl Sp. z o.o. | Masovian |
| DHT-IT | Łódź |
| Diceus | |
| Digers | West Pomeranian |
| DIGITAL | Greater Poland |
| Digital 2 | Greater Poland |
| Digital Codes | |
| Digital Core Design Sp. z o.o. Sp. k. | Silesian |
| Digital Dragons | |
| Digital Fingerprints | Silesian |
| Digital First AI | |
| Digital Forms Sp. z o.o. | |
| Digital Habitat | |
| Digital Holding | |
| Digital Melody Games | |
| Digital Neuma | Lesser Poland |
| Digital Rank | |
| Digital Team | |
| Digital Templars Sp. z o.o. | |
| Digital-Images | |
| DigitalArt.pl | Masovian |
| DigitalHill.pl | Lower Silesian |
| Digitalisation Team | |
| Digitalk Network S.A. | |
| Digitalk Sp. z o.o. | |
| Digiteum Sp. z o.o. | |
| Digiway Media Sp. z o.o. | |
| DINFO | Silesian |
| Dioma | |
| Direktpoint | Masovian |
| Dirlango |