JOSM

JOSM (listen^ⓘ) (Java OpenStreetMap editor) is a free software desktop editing tool for OpenStreetMap geodata created in Java, originally developed by Immanuel Scholz and currently maintained by Dirk Stöcker. The editing tool contains advanced features that are not present in OSM's default online editor, iD.

Some notable features of JOSM are importing GPX files (GPS tracks), working with aerial imagery (including WMS, TMS and WMTS protocols), support for multiple cartographic projections, layers, relations editing, data validation tools, data filtering, offline work, presets and rendering styles. JOSM provides more than 200 keyboard shortcuts for the core functions.

Many additional features (like tools for drawing buildings, adding Wikipedia links or viewing data in 3D) are available through the plugins. There are more than 100 of them in the repository.

The highest number of edits in OSM are done using JOSM. The software was used to perform several large scale OSM imports, including TIGER data in the United States.

JOSM can also be used for editing an OSM sister project OpenHistoricalMap. It's included as a package in many Linux distributions like Ubuntu, Debian, Fedora, Arch Linux and the OSGEO Live DVD

Various tutorials are available. The LearnOSM Tutorial, translated in 16 languages, has a section on JOSM. It covers the editing process, the tools, the plugins, the presets, the imagery functionalities, conflict resolution and other features.