Tools

Mobile

• Organic Maps: Android & iOS app for viewing maps
• StreetComplete: Android 'game' where you complete quests by doing surveyor tasks
• EveryDoor: Best for editing POIs, entrances, and business details
• Mapillary: For collecting street-level imagery
• OSMGo!: Editor on Android

Desktop / Web

• openstreetmap.org: iD editor
• osmose: For detecting QA issues with map data
• JOSM: Detailed editing (steeper learning curve)
• RapidEditor

Guides

• wiki.openstreetmap.org