- OpenGo - Find places that are open now
- OpenGTS™ Tracker Lite
- OpenHours - Find Shop, Bank...
- OpenMaps - Topographic maps
- OpenMaps PRO Open Source Maps
- OpenMapTiles
- OpenMetano
- OpenNow!
- OpenSeaMap
- Openway
- OpenWind
- Operr Driver
- Oplev Møn
- Measure your Hikes
- Indigo Neo (ex-OPnGO)
- Oppen
- OptiBus Leon
- OptimalRouteMaps
- OptimoCamino
- Optimum Fleet
- Optimus Tracking
- OptiPlay
- Optiroute Driver
- OptiUnit
- Optymo - SMTC
- OPYC
- Orari Autobus Pavia
- MooveTO - Turin and Piedmont
- ORBCOMM
- Orbit (Customer)
- Orbit (Driver)
- OrbitalTrack
- Orbitrax
- Orca: Boat GPS, Charts, Routes
- ORCee
- ORD Employee Shuttle
- Ordine Avvocati Cassino
- Ordum Kart
- Oreem Delivery
- Oregon NW Mushroom Forager Map
- Oregon Pocket Maps
- Oregon Roads Traffic
- Oregon Roadways
- Oregon State Parks & Areas
- Oregon Roadways
- Oregon State Parks & Areas
- Oregon Taxi
- Oregon's Roadways
- Organic Maps Offline Hike Bike
- Orient Taxi
- Orienteering Compass & Map
- Orienteering GPS Logger
- Origin Track
- Oriient IndoorGPS
- ORIN - GPS Tracking
- Orion
- Orion eLog ELD
- ORIZO
- Orlando Theme Park Day
- Orlando Looksee AR
- Orlando Map and Walks
- Orlando MCO
- Orlando Offline Map and Travel Trip Guide
- Orlando Travel Guide Offline
- Orlando.