Mlrutil is a program to interact with MLR GPS units sp24xc free flying written under gpl license.
It is in an early (an maybe never grows up) stage, on which is possible to download a track into an ascii file suitable for use in other program such as: spread sheet (openoffice calc) or GPLIGC flying software.
One major improvement could be saving tracks in GPX format!
See the source in the gitweb repository.
update: Since serial port are all usb based, It does not work anymore.