GPSBabel 1.3.4

GPSBabel converts waypoints, tracks, and routes between popular GPS receivers and mapping programs. It also has powerful manipulation tools for such data.
GPSBabel reads, writes, and manipulates GPS waypoints in a variety of formats. Over 100 supported formats include GPX, Magellan and Garmin serial and USB protocols, Geocaching *.loc, Garmin Mapsource, and Magellan Mapsend.
By flattening the Tower of Babel that the authors of various programs for manipulating GPS data have imposed upon us, it returns to us the ability to freely move our own waypoint data between the programs and hardware we choose to use.
It contains extensive data manipulation abilities making it a convenient for server-side processing or as the backend for other tools.
It does not convert, transfer, send, or manipulate maps. We process data that may (or may not be) placed on a map, such as waypoints, tracks, and routes.
Almost certainly. GPSBabel runs on Microsoft Windows 98, ME, 2000, and XP plus POSIX OSes such as Linux, UnixWare, OpenServer, Solaris, FreeBSD, and OSX.