RouteConverter is a free, user friendly GPS tool to display, edit, enrich and convert routes, tracks and waypoints. It helps me to plan routes and consolidate tracks, and I hope it could help you.
The user friendly RouteConverter GPS tool:
works with routes, tracks and waypoints;
displays, edits and converts GPS data;
supports more than 79 of the most common GPS file formats;
automatically detects the file format;
opens files, URLs and ZIPs by drag-and-drop, file dialog, system clipboard.