There are also primary schools with a specific educational concept. They teach from certain ideas about upbringing and education. For example in Amstelveen Montessori schools (De Linde and Mio Mondo) and Waldorf School (Parcival)
https://debloeiwijzer.nl/
https://mkcmiomondo.nl/
https://www.montessorischooldelinde.nl/
https://www.vrijeschoolparcival.nl/
https://www.schoolofunderstanding.nl/amstelveen/