The Mappers section was set up (and sections named) by Board member Greg L. Maybe "Mapping Services" would be better?
Peter's updated list will presumably include your three...if they contact him, or if you can supply him with the relevant info. People are listed if: 1) they were on the old website (<2010) or 2) have contacted me to be added.
It's definitely a good set of resources to have. I think Peter has mentioned updating the list of resources as part of his mapping project, and we can presumably draw more attention to it by explicitly contacting clubs, putting on social media, mentioning it in ONA, the newsletter, and at the convention. Keeping clubs informed of everything that is known about mapping in the community is an ongoing challenge.