GPSBabel
GPSBabel converts and transfers data like waypoints, tracks & routes.
** This site is of historical interest only. The project is active on www.gpsbabel.org and github. Some of the county/state files remain active, but no version of GPSBabel should be downloaded from this site. **
GPSBabel reads, writes, and manipulates GPS waypoints in a variety of formats. Over 100 supported formats include GPX, GeoJSON and Garmin serial and USB protocols, Geocaching Pocket Queries and *.loc and more!
For Windows, Linux, Mac.