- DAIN Studios
- Darkglass Electronics
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- Dear Lucy
- Delight Packaging
- Deli Piste
- Delta Cygni Labs
- De Motu
- DesignMyBooks.com
- Detection Labs
- Devea Software
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- Dexmen
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- Digital Workforce
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- Diory
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- Disior
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- Distillery Ägräs
- Doctual
- Documented.zone
- Dodreams
- Doerz
- Dogs First
- Dojanga
- Doorway Games osk
- Dottli
- Duara Travels
- Ductor
- DustComb
- Duuers
- DuuniBuumi
- Duunitori
- Dynamic5