GPX Inspector is an Eclipse RCP application for managing and viewing GPX files. It uses Google Earth for viewing tracks, routes, and way points, and has many options for creating, combining, modifying, and saving GPX files.
More information and FAQ are at https://kennethevans.github.io as well as more projects from the same author.
Licensed under the MIT license. (See: https://en.wikipedia.org/wiki/MIT_License)