| Delucks GmbH | |
| Delwave distribution gmbh | Bavaria |
| DEMA Electronic AG | Bavaria |
| Demandsoft GmbH | |
| Dembach Goo Informatik GmbH & Co. KG | North Rhine-Westphalia |
| DEMIC Datentechnik GmbH | Baden-Württemberg |
| Demnet GmbH | Hesse |
| Demodesk | |
| DENIC eG | Hesse |
| denkapparat GmbH | |
| Denkwerk GmbH | |
| denovoMATRIX GmbH | |
| Denpaflux GmbH | |
| Denzhorn Computer-Service GmbH | |
| DEOPWARE | |
| Department X GmbH | Hesse |
| Deployables Cubed GmbH | Bavaria |
| Deposix Software Escrow GmbH | Bavaria |
| Der Bundesbeauftragte für den Datenschutz und die Informationsfreiheit | North Rhine-Westphalia |
| Der Medienwürfel, Matthias Hopf & Daniel Völkel GbR | Baden-Württemberg |
| Der Punkt GmbH | Baden-Württemberg |
| Der Softwareentwickler Blog | Schleswig-Holstein |
| der.heckser | Bavaria |
| DerEuroMark | |
| Dermagnostix | |
| DERMALOG Identification Systems GmbH | Hamburg |
| dermanostic GmbH | |
| Dermapharm AG | |
| deSEC e.V. | |
| Design for Humans | Berlin |
| Design Sprint Academy | |
| Design-Coding | Hamburg |
| Design-Creative | North Rhine-Westphalia |
| design-X.de | North Rhine-Westphalia |
| DESIGNA Verkehrsleittechnik GmbH | Schleswig-Holstein |
| DesignBits | |
| designenlassen.de | Bavaria |
| DesignerGruppe | Rhineland-Palatinate |
| designpark Internet GmbH | Berlin |
| Designplanung Reiprich | Saxony |
| designschulz | Berlin |
| Designwork | Baden-Württemberg |
| DeskCenter Solutions AG | Saxony |
| deskMate | |
| DeskWare Products GmbH | Bavaria |
| dESKWORK.IT | Hesse |
| DETAIL Business Information GmbH | |
| DETEC Software GmbH | Hesse |
| Detlef Rheinbay | Hesse |
| Detlef Schuler Information & Technologie | Bavaria |