I've used Maptech in the past. They have different solutions available depending on what you want to do (Offshore Navigator, Chart Navigator, Chart Navigator Plus, etc).
Their main office is local (Amesbury, MA).
I also have Garmin's Homeport software that lets me connect the SD card from my chartplotter to my home pc....and all of the G2 charts are accessible (as well as my waypoints, tracks, routes, etc)
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