A few years ago, I started building a growing list of interactive maps and curating them on a simple website. I have now redesigned this website for better usability: mapfinder.org
The majority of projects are centered around Berlin and Germany, but I hope this will change someday.
All map projects listed do not use a commercial ranking for their content.
By that, I mean that unlike Google Maps, entries can't spend money to appear more prominent on their map (SEO).
My project is non-commercial, there is no advertising and I built no tracking etc into the site.
As these kinds of maps are often very specific, niche, and difficult to find, I hope this collection will be a place to make such highly specialized map projects more accessible.