At the end of the day, Jeppesen have won the day with their products. I've found that many professional pilot's might try some other amateur "I'm a pilot and programmed xxx" products.. but after a year or two, Jeppesen kill them all.
They already have all the features, the NOTAM feed, their own WX feed and the followership of many pilots. They just have to port it to a new OS. When you know what you've programmed, this isn't a particularly difficult process. Much harder than 3rd parties working it out for themselves.