By supporting NeTEx, a large chunk of Italy could be added (and, in the future, all of it) to ÖPNV Navigator (see: https://github.com/public-transport/transitous/issues/117). The Italian government is now working on publishing every region's public transport as NeTEx, not GTFS, to their NAP.
As far as I can tell, NeTEx only provides planned timetable data (similar to GTFS). TripKit cannot calculate routes by itself and relies on a third-party service to do so.
By supporting NeTEx, a large chunk of Italy could be added (and, in the future, all of it) to ÖPNV Navigator (see: https://github.com/public-transport/transitous/issues/117). The Italian government is now working on publishing every region's public transport as NeTEx, not GTFS, to their NAP.