| Dev-Play | Bucharest |
| Deventure | |
| Devious Technologies | Bucharest |
| Devista Consulting S.R.L. | |
| Deviz | Brașov |
| DevNest | |
| Devodrome | |
| DevPlant | |
| DevTalks | |
| DevTeam.ro | |
| Dexign | |
| Diablos Computer | Bucharest |
| Diadi Telsat | Bucharest |
| Diamond Consulting | |
| diARK | |
| Different View | Bucharest |
| Digi Communications N.V. | Bucharest |
| Digidemat | |
| DigiSign S.A. | Bucharest |
| Digital Access Network S.R.L. | Bucharest |
| Digital Advisors Team | |
| Digital Artflow S.R.L. | Bucharest |
| DIGITAL ByteDesign | Cluj |
| Digital Craft | |
| Digital Design Team | Bucharest |
| Digital Distrikt 32 S.R.L. | |
| Digital Expression | Bucharest |
| Digital Metrics | |
| Digital Ninja | |
| Digital Partners | |
| Digital Software Development | Bucharest |
| Digital Star | |
| Digital Summer Agency | |
| Digital Systems XXI S.R.L. | Bucharest |
| Digital Workforce S.R.L. | |
| DigiTales | |
| Digitalhero | |
| Digitalya | |
| DigiTech Solutions | Bucharest |
| Digitline Automatizari S.R.L. | Bucharest |
| DigiWise.Ro | |
| DirectWEB | Harghita |
| Display Solutions | |
| DlhSoft | Cluj |
| Docbook | |
| DocProcess | |
| DojoCode | |
| DominioPC | Cluj |
| Donau | Cluj |
| DoPDF by Softland | Cluj |