JOSM is an extensible editor for ​OpenStreetMap (OSM) written in ​Java 1.6. Currently it supports loading stand alone GPX tracks and GPX track data from the OSM database as well as loading and editing existing nodes, ways, metadata tags and relations from the OSM database.
Launch josm.jnlp (version 19039) recommended version, all platforms, automatic update (​Web Start)
Download josm-tested.jar (version 19039) all platforms (how to run)
Windows installer (version 19039)
Mac OS X package (version 19039)

Latest development version (19053), Ubuntu package repository and other download options.

• What has been changed recently?
  • startup notes (most important changes)
  • summarized changelog (nicely summarized)
  • SVN changelog (very detailed)

Extensions

• Plugins (installation instruction)
• Presets (installation instruction)
• Styles (installation instruction)
• Maps (installation instruction)

Getting Started | Help

• Comprehensive introduction on the ​OpenStreetMap wiki.
• The official help system / documentation (can be reached with <F1> from within JOSM).
• Tutorial on ​flossmanuals.net.
• Some video tutorials (mostly outdated)
• Ask members of the OpenStreetMap community on
  • the ​OSM-forum
  • various ​OSM mailinglists (e.g. ​talk and ​newbies, ​list overview)
  • the ​OSM IRC channel
• HowTos

Found a bug? | Have an idea? | Make a suggestion?

• Please report any bug found: Create a new ticket. When reporting a bug, please include the version (version number can be found in menu Help/About).
• Discuss ideas and suggestions also in the bug tracker or on the ​josm-dev mailinglist

Contribute

• use JOSM
  • report bugs, discuss ideas, think of possible enhancements (see above)
• participate in bug tracking
  • review bugs, up/down vote tickets, find duplicates, test bugs, add more descriptive texts
• update/extend the online help
  • unify all JOSM related Wiki pages and join them with the online help
• translate program/documentation
• design fancy new icons
• write code – get the code and write patches …
  • from the official Subversion repository: svn co http://josm.openstreetmap.de/svn/trunk josm
  • from the official OSM Subversion repository (including plugins): svn co http://svn.openstreetmap.org/applications/editors/josm
  • from the unofficial ​GitHub mirror: git clone git://github.com/openstreetmap/josm.git
  • see developers guide for build instructions and other details

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This site

• This site is a combined online help and bug tracking system for JOSM and JOSM plugins
• No login is required to use this site (neither for reading nor for changes to wiki or bug tracker)
• A login has following advantages:
  • The JOSM applet can store settings on the server
  • Mails are sent for changes in own bug tracker tickets (This is possible by entering an e-mail as user name in the tickets, too. But then be aware of the circumstances 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 which have no e-mail address or which have not been used at least once are automatically deleted.
• The login to edit the OpenStreetMap database has nothing to do with this server!
• NOTE: The secured HTTPS version of this site uses a self-signed certificate with 26:8B:4D:CB:AD:04:E7:50:EC:94:F8:34:83:CE:7C:06:8D:FD:61:3D as SHA1 fingerprint.
  You need to accept this certificate as valid to silence the warnings of your browser.

Contact

• For problems, ideas, suggestions use the bug tracker
• The volunteers creating JOSM can be reached using the ​josm-dev mailinglist
• The server running this service is operated by ​FOSSGIS society