WieWasWie (WhoWasWho) is the most comprehensive genealogical database in the Netherlands. Archives in all the provinces participate in this website to publish indexes and sometimes even scans of their records. Up until now, WieWasWie was only available in Dutch but an English version is now available.
When using the English version, keep in mind that the actual contents of the database are not translated. For example, occupations will be in Dutch. View a list of common occupations with their English translations or use a translator like Google Translate.