For Friesland you can search on the website
www.allefriezen.nl; the site is also in Englisch. For Groningen you can take a look at
http://www.allegroningers.nl (Dutch only). It is possible to use wildcards.
For Noord-Brabant you can search in the index of BHIC (this site).
It is also possible to search at
www.wiewaswie.nl where you can find ancestors from all around the country. For better search options you need a membership. However, in case you have access to Ancestry, you can search there.
To see all the registrations, please visit zoekakten.nl. Here you find links to scans of the registrations at FamilySearch.
I wish you success on finding information on the ancestors. In case you can't find the wanted information, please feel free to ask. Most of the time searching for the information yourself gives you more fun...