- Okee in Medical Imaging
- OKN Exercise
- OKN Strips
- OKNDrum: Optokinetic Drum
- Okolo Ball Clinic
- Okolo Crosses Clinic
- Okolo Puzzle Clinic
- Okolo Spider Clinic
- OLC Doc
- OLC Patient
- OLC-MA
- Oliv-e
- Olivia Naylor Clinic
- Olivier Health
- Ollomol
- FHP Exchange
- OLT Anesthesiology Trainer
- Olá Buco
- Om Meditasyon: Mindfulness
- Omaeläinklinikka
- OMama
- OMC 2023
- OMCSA k-anatomy
- Omega Healthcare
- Omentum
- OMF - Orthodox Mutual Fund
- Omida App
- Omint ART
- OmMeGo
- Omni
- Omni Care
- Omni ROTA
- Omnicell CPMobile
- Omnicell SupplyX
- OMNIFIT Mindcare
- OmniLife
- OmniMedix Medical Calculator
- Exeevo Omnipresence Go
- Omran Doc
- Omran Patient
- Omron Bi-LINK Gateway
- Dello+
- Dello+ PRO
- OMS AnthroP
- OMS Connect
- OMS Resident Surgical Log
- OMS Connect
- OMS Resident Surgical Log
- Oméris et Moi
- On Call Central
- On Call Diabetes Management
- Oncall for Interns
- On Call Mini Diabetes Manager HD
- On Call Pharmacy
- On Call® Care Alliance
- ON ENFERMERIA
- On The Mend
- On The Spot!
- On Vacation Doctors
- On/Go
- ONA: Hypnobirthing app
- OnBase Healthcare (Foundation)
- OnBase Mobile Healthcare
- ONCALLbuddy
- OncAmigo
- OnCare
- Onco CHO
- ONCO Italia