JOSM is an extensible editor for ​OpenStreetMap (OSM) for ​Java 8+. It supports loading GPX tracks, background imagery, and OSM data from local sources as well as from online sources and allows to edit the OSM data (nodes, ways, and relations) and their metadata tags. JOSM is open source and licensed under GPL​.
Start josm.jnlp (newest tested version (currently 19253)) preferred distribution channel, all platforms, monthly automatic update (how to start)
Download josm-tested.jar (version 19253) all platforms (how to run). When the version changes, you have to download it to update it (unlike josm.jnlp)
Windows installer (version 19253, how to install)
MacOS package (version 19253, how on Mac)
Development version josm-latest.jar (19259 |.jnlp), Ubuntu repository and all Download options.

Getting Started

• The Introduction page will guide you to your first successful edit.
• See the official help system – <F1> reaches it everywhere on JOSMs interface and the help button in dialogs.
• Ask members of the OpenStreetMap community on
  • the ​OSM-forum
  • OpenStreetMap's ​question-and-answer site
  • various ​OSM mailing lists (e.g. ​talk, ​list overview)
  • the ​OSM IRC channel, including our ​own room

Extensions

• Plugins add more complex program features. (installation instructions)
• Presets allow you to select predefined tags for objects. (installation instructions)
• Rules check and fix invalid data.
• Styles change the appearance of the mapview. (installation instructions)
• Backgrounds allow you to trace osm data from e.g. aerial imageries. (installation instructions)

Recent changes

• Startup notes (most important changes)
• Summarized changelog (nicely summarized)
• SVN changelog (complete log)

Found a bug? | Have an idea? | Make a suggestion? | Like to contribute?

• Please report any bug found! Via the Report Bug form in the Help menu it is easy.
• Create and discuss ideas and enhancements as ticket and contact the team.
• Contribute with updates, corrections and translations to unify all JOSM-related pages and join them with the online help.
• Participate in bug tracking with reviewing bugs, up/down vote tickets, find duplicates, test bugs, add more descriptive texts.
• Design fancy new icons.
• Develop get the Source and see the developers guide for build instructions and other details.

This site

• This site is a combined help and bug tracking system for JOSM and JOSM plugins.
• No login is required to use this site (neither for reading nor for wiki edits or the bug tracker).
• But logging in has advantages:
  • Mail is sent for changes in your bug tracker tickets. This is possible by entering an e-mail as a username in the tickets too, but then be aware that the address is openly visible and you are unable to change that later.
  • Page settings are remembered (e.g. input field size and a lot of other stuff).
• Logins that have no e-mail address or which have not been used at least once are automatically deleted.
• Logins to edit the OpenStreetMap database are separate from the logins on this server.
• Copyright (CC-BY-SA and LGPL since April 2014) of this site is stated in the footer.

Contact

Server sponsored by:

• The volunteers creating JOSM can be reached using the ​josm-dev mailing list or the ​#josm IRC chat.
• If you use social networks, see our ​Facebook and ​Twitter pages.