To make the Openfietsmap more complete there are several poi sources on the web related to bicycle touring. Here are only a few that are useful for planning cycling trips, specifically for the Netherlands:
OSM Fietsrouteplanner - Cycleroute planner based on OSM data, covering the Netherlands, Belgium, Niedersachsen, Nordrhein-Westfalen.
Brouter - Very fast and powerful web-based bike routing software based on Openstreetmap data. Can also be used in Osmand android app for off-line routing.
RidewithGPS.com - My favourite web-based bike route planner with multiple maps options like Google Maps, Streetview and Openstreetmap
Waymarked trails - This map shows sign-posted cycling routes all around the world on OSM; with downloadable GPX tracks
Fietsersbond Fietsrouteplanner Cycleroute planner of the Dutch cyclists federation
Voetveren POI-bestand Ferries for cylists/hikers in the Netherlands
GPS-tracks LF-routes National long distance cycle routes
Fietsknooppuntenkaart van Jan Kelder / Javawa Dutch regional cycling node network
mtbroutes.nl Mountainbike routes in the Netherlands
Archies campings >30000 campsite pois in Europe
Drinking water - POI data of drinking water in the Netherlands