JOSM is an extensible editor for ​OpenStreetMap (OSM) written in ​Java 1.6. It required the Pandora Java pack to work!

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.

http://repo.openpandora.org/?page=detail&app=josm