- Odonto Jaraguá
- Odonto Prescrições
- Odontología UFM
- OdontoSonrie
- OdontoWeb
- OdourCollect
- Odys Mobile
- OE Acronyms
- OE TRACKER attendance app
- OEBAC Mobile
- OEI THCT
- OET Medicine App for Doctors
- OET Nursing App For Nurses
- Office of the Medical Director
- OfficeEMR Mobile™
- Official Cisne Calculator
- Officine Expo Marrakech
- Offline BP Log
- Ofica 2
- Ofimedic App
- Oftalmo Clinica
- OG Data Link
- OG Odontogenesis
- Oh Baby! Pregnancy Exercise
- OH-I-CAN
- Ohealth App
- Ohio State MyHealth
- OhioHealth
- OHIP Diagnostic Codes
- OHM Vaccination App
- OhMD HIPAA Compliant Texting
- OhmTrak
- OHN SBIRT
- OHSU Portsmouth
- Oirepäiväkirja
- OIS Med
- OITcontrol
- Ojeda Alergólogos
- Okadoc
- OKAKI PHIX Mobile