For all people travelling to the Netherlands, there is this very good official public transportation travel planner: www.9292.nl/en
All public transportation companies in Netherlands, from fast ferries in Rotterdam to local trains in Fryslan feed the system, allowing the traveler to look for any trip anywhere in the country. It is an efficient and reliable tool, so I'm leaving the tip here. You can search points by address, postcode, POIs etc. It will show any combination required of different means of transportation and/or companies.