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Free Geography Tools writes about a multi-purpose GPS file format converter that handles ptm (MapPoint) and est (Streets & Trips) files.

From Free Geography Tools - "Not as many as GPSBabel, but it does a few that GPSBabel doesn’t, and the interface is a bit easier to handle."

Input formats:
- Autoroute Express (.axe, .axg)
- Streets & Trips (.est)
- MapPoint (.ptm)
- MapSource (.gdb, .mps)
- TomTom 3, 5 & 6, Go, Rider, One (.itn, .ov2)
- Navigon MN|4, MN|5 & MN|6 (.rte)
- Destinator PN (.dat)
- Marco Polo, Falk Navigator, Motorrad Tourenplaner & OnRoute (.bcr)
- GPS eXchange (.gpx)
- GPX MapSource (.gpx)
- Garmin PCX5 (CartoExploreur) (.rte)
- Magellan SD (Meridian et eXplorist) (.rte, .upt)
- ViaMichelin (.xvm)
- IGN Rando (.rdn)
- OziExplorer (.rte)
- OziExplorer CE (.rt2)
- Google Earth (.kml)
- CSV (Longitude,Latitude,Comments)

Output formats:
- Autoroute Express (.axe) (Version 2004 and higher)
- TomTom 3, 5 & 6, Go, Rider, One (.itn)
- Navigon MN|4, MN|5 & MN|6 (.rte)
- Destinator PN (.dat)
- Marco Polo, Falk Navigator, Motorrad Tourenplaner & OnRoute (.bcr)
- GPS eXchange (.gpx)
- GPX MapSource (.gpx)
- Garmin PCX5 (CartoExploreur) (.rte)
- Magellan SD (Meridian et eXplorist) (.rte)
- ViaMichelin (.xvm)
- IGN Rando (.rdn)
- OziExplorer (.rte)
- OziExplorer CE (.rt2)
- XML Location (.loc)
- Google Earth (.kml)
- CSV (Longitude,Latitude,Comments)

For the full write-up including screenshots see:
GPS File Format Converter - Free Geography Tools