The Virtual-organs.nl made the sample set of Walcker organ from Wildervank. It was the first sample set that I bought. I really liked this sample and it helped me to get to know Hauptwerk.
The makers of sample set (Dirk Swama and Jaap Plaisier) were very nice and helpful. Unfortunately, the Virtual-organs company ceased. They made their samples available for free download and use. The samples are using the Creative Commons licence, so they are free to use and edit too.
I remembered this lovely sample set. I pulled out and refurbished a bit (I made of multi-loop and multi-release, added a bit of reverb) and created an expansion from its own sound material.
It completed a 30-stops nice-sounding sample set which I just published. I made this joy, you can use it that way. The download and use for absolutely free.
Wildervank extended sample set
Peter Markuj plays the organ.