gpsWrite for Mac

From Hiketech:

With gpsWrite you can easily enter waypoints, tracks or routes and save them to file for use with Link2gps or topoDraw, or you can use gpsWrite to edit or organize the waypoints, tracks or routes gathered with link2gps or created with topoDraw.
gpsWrite can also import navigation data from tab and comma delimited text files as well as from gps exchange (.gpx) files allowing you to tap into a virtual endless source of navigation data on the internet.
(Requires link2gps to transfer data from and to your GPS)