Seems there are some people interested, so I will post some information which I collected somewhere else:

MindMeister / https://www.mindmeister.com

Propose the option to include interactive MindMaps on your Website. The free version allow you to display read-only Map, the 1 user pay version allow your (unlimited number of) visitors to do modify and update your MindMap.

Sample: http://natalienews.com/passive-income-mindmap/

MindMup / http://blog.mindmup.com/

Mentionned allready above, MindMup does have a new feature called "MindMup Atlas" which allow you to display your interactive mindmaps very simple in a iframe on your Website. Maps are read only but as MindMup is user driver, i was invited to request a version which allow user updates directly on my website.

Sample: https://atlas.mindmup.com/mindmup/mindmup_atlas_publish_mind_maps_online/index.html

Mindomo /  www.mindomo.com 

Mindomo allow you can display Maps on your Website. With a pay version, you can also allow guests to update your maps. For that, You simply include a "update this map" link on your website and users are directed to Mindomo to do their changes which are than displayed on your website.

Sample: http://www.mindomo.com/fr/mindmap/webmaster-tool-box-29075fc531f442ea9b777bfe348a88ac

Thanks David.

Let's hope that some other users have also Ideas but I think your link will get most poeple on there way.

I made a travel map some time ago, you can offcource use another picture and create this way yourself some kind of map with links.....

https://helpcenter.websitex5.com/post/85570

BR A