• Department of Defence

• Department of Environment, Climate and Communications

• Department of Housing, Planning & Local Government

• Departmnt of Justice & Equality

• Deycom Computer Services Ltd

• DFM Systems

• DgTek Solutions Ltd

• Diacom

• DIGI Systems Ltd

• Digicom

• Digilogue

• Digitalforge

• Digiweb Ltd

• Dimension Network Systems Ltd

• Dimension Networks

• Distilled SCH

• DMS

• Docket & Form International Ltd

• Document Centric Solutions

• DoneDeal.ie

• DP Connect

• Dublin Dental university Hospital

• Dunnes Stores

• Dynamic Business Systems (DBS)