I would suggest to split up your question for one European route planner into one or more Dutch and German route planners. Then you take more advantage of available local expertise.
3 local route planners for the Netherlands: http://www.fietsersbond.net/fietsrouteplanner/fietsroutes-recreatieveplanner/ http://www.falk.nl/ http://www.vv.nl/ There are more initiatives but they all cover only one region or city.
3 local route planners in Germany (Berlin, Nordrhein Westphalen and Hessen): http://www.bbbike.de/cgi-bin/bbbike.cgi http://www.radroutenplaner.nrw.de/ http://www.radroutenplaner.hessen.de/
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I would suggest to split up your question for one European route planner into one or more Dutch and German route planners. Then you take more advantage of available local expertise.
3 local route planners for the Netherlands:
http://www.fietsersbond.net/fietsrouteplanner/fietsroutes-recreatieveplanner/
http://www.falk.nl/
http://www.vv.nl/
There are more initiatives but they all cover only one region or city.
3 local route planners in Germany (Berlin, Nordrhein Westphalen and Hessen):
http://www.bbbike.de/cgi-bin/bbbike.cgi
http://www.radroutenplaner.nrw.de/
http://www.radroutenplaner.hessen.de/