- ORBIS COMFORT-CONTROL
- Orbit: Sun Position
- Orbiter - Earth Visualizer
- OregonAir
- OrientElba
- OSHA-NIOSH Heat Safety Tool
- OSS Weather
- Oto App
- OurTheEarth:Genuine Earth as viewed from space
- Outside Now
- Overdrop - Weather & Widgets
- Owl Weather
- Oz Radar 2
- Oz Radar Lite
- Oz Radar TV
- Oz Radar Weather
- Oz Weather Plus
- OzSun UV Alert
Opening the iTunes Store.If iTunes doesn’t open, click the iTunes icon in your Dock or on your Windows desktop.Progress Indicator
Opening Apple Books.If Apple Books doesn't open, click the Books app in your Dock.Progress Indicator