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Operating systems: starting with O

Name a computer operating system that starts with O. Hopdown accepts 27 answers here. Common answers keep your bunny near the surface; rare ones dig deeper. An operating system or OS distribution for computers, phones, consoles or devices, past or present. Canonical name starts with O.

Part of Operating systems.

Answers

• openSUSECommon
• OpenBSDCommon
• OpenVMSUncommon
• OpenHarmonyUncommon
• OberonUncommon
• Oxygen OSRare
• OpenStepRare
• One UIRare
• OriginOSRare
• Oracle LinuxRare
• OS X Mountain LionRare
• OS X MavericksRare
• OS X YosemiteRare
• OS X El CapitanRare
• OpenMandrivaRare
• Oracle SolarisRare
• OpenSolarisVery rare
• OpenIndianaVery rare
• OpenDOSVery rare
• openEulerVery rare
• OpenCloudOSVery rare
• openSUSE TumbleweedVery rare
• openSUSE LeapVery rare
• openSUSE MicroOSVery rare
• OpenMediaVaultDeep cut

Plus 2 more answers you'll have to find yourself.