- Oriya keyboard - Oriya Input Keyboard
- Oriya Keys
- Oriya Transliteration Keyboard by KeyNounce
- Orizon
- Orizon Connect
- Orkidē
- Orlando Collects
- Orlo App
- ORMATEK FRANCHISING CONFERENCE
- Ornitodata
- Oronoco Online Auctions
- Orovalle
- ORP(One Riverside Park)
- Orpat Distributor App
- Orsegups - Meu Condomínio
- Orsegups Rastreamento
- ORTEC Employee Self Service 7
- ORTEC MRP
- Orten 3D Cam
- Orthodox Prayer in Tigrigna
- OrthoGraph BLK360
- OrthoGraph – Floor Plan
- OrthoKit
- Ortholutions
- Orthomax
- OrthoPediatrics PediPortal
- ORTIM c6
- ORTIZ adm
- ORTouch+
- Ortsdaten
- ORVIBO Home
- Orwell: Online Privacy
- OryxHub
- Oryzativa
- OrçaFascio Medição
- Orçamento Pessoal - Finanças
- Orðaflipp - Fyrir krakka sem þora að skapa
- OS Cleaner
- OS Cleaner Pro - Disk Cleaner
- Os i Coop
- Os Nossos Filhos
- OS Safeguard
- OS Safeguard Lite
- OS Vehicle
- OS2indberetning Kørsel
- GROSA
- OSAP
- OSARi Simple Secure VPN
- Oscar Browser
- OSCAR.music
- OSCC Mobile Supervisor
- OSCE
- Oscilyzer
- OSF Events+
- OSFE
- OSG App
- OSG Performance Suite
- OSHA Safety Regulations Guide
- OSHRM
- OSI Comfort
- OSIRIS Erasmus University
- OSIRIS Hanzehogeschool
- OSIRIS HAS University
- OSIRIS Hotelschool The Hague
- OSIRIS MBO Utrecht
- OSIRIS Radboud University
- OSIRIS Tilburg University
- OSIRIS University of Aruba
- Osiris Zuyd University