- Due — Reminders & Timers
- Due.Zero
- Dues • Recurent payment alerts
- Duet Air - Remote Desktop
- Duet Camera - Dual Recording
- Duet Display
- DuetCam
- DUEVI Alarm PRO
- Duevi Connect
- Dufferin U-Track
- Dufour EC
- DuGood Federal Credit Union
- DUGSI - Dugsi Management Soft
- Duh!
- Duit App
- DUITT
- DuJour.pro
- Dukka - Bookkeeping made easy
- DULCOnneX Blue
- Dullmanager
- DuLoad for OneDrive
- Dulux Barcode
- Dulux Colour Concept
- Dulux Colour Sensor
- Dulux Connect
- Dumesnil
- Dumon - Portaria Remota
- Dumpster - easy link saving
- Dumpsters on Demand - RRO
- Dunamar SAT Agricultores
- fwfm
- Dunlop Belt Buddy
- Dunya Task Manager
- DUO Academia
- Duo Browsers
- Duo Remote
- Duocon Condomínios
- Duotransfert
- Duowar Tools
- Duplica
- Duplicarius
- DupScore
- Duplicate Bridge Scoring
- Duplicate Cleaner
- Duplicate Cleaner Master
- Duplicate Contact Merger & Remover
- Duplicate Contacts Finder
- Duplicate Contacts Fixer
- Duplicate Contacts Manager
- Duplicate Contacts Remover - Contact Manager And Cleaner
- Duplicate Detective 2
- Duplicate Detective: Cleaner
- Duplicate File Detective
- Duplicate File Doctor
- Duplicate File Finder Pro
- Duplicate File Finder Remover
- Duplicate File Scanner
- Duplicate Files Cleaner
- Duplicate files Filter
- Duplicate Files Sweeper
- Duplicate Finder and Remover
- Duplicate Finder X
- Duplicate Photos Cleaner .
- Duplicate Remover
- Duplicate Spy
- Duplicate Tab Preventer - Tool
- Duplicate Zapper
- Duplicates Cleaner
- Duplicates Finder - Find, review and remove duplicates
- Duplicato
- DupliCal Calendar
- DuPont WaterApp
- Dura Color 4.0
- DuraFit Catalog
- DuraPost® FenceBuilder
- Duret Vidéo
- Durham County Recycles
- Durham One Call