JOSM

JOSM (Java OpenStreetMap Editor) is a free, desktop-based software tool used by contributors to create, update, and refine map data for OpenStreetMap. It allows users to directly edit map details such as roads, buildings, and points of interest with precision. JOSM supports importing satellite imagery for accurate mapping and offers advanced features like layering, plugins, and data validation, making it suitable for both casual mappers and professional cartographers. Essentially, it’s a powerful program that helps improve and maintain open, community-driven digital maps used worldwide.