Concept/thing/abstract maps
Lifemap, Map of Life

Open Trees - explanation
Radio Garden - Listen to radio around the world
Mapping the shadows of New York City
ShadeMap
Internet map

Geographical maps
OpenStreetMap
MapComplete
Beescape
Wiki Atlas, Nearby Wiki
Mineral database
Atlas of Surveillance
Cybermap
Queering The Map
LocalWiki
Blitzortung.org
earth.nullschool

Tracking maps
Marine Traffic
Airport Traffic
Ocearch

Trend maps
Fall Foliage Map - (US specific)

OpenSeaMap
Urban Exploration Resource
RiverRunner (not sure how accurate this is) - track where a raindrop will end up depending on where on the globe it falls

Food maps
Falling Fruit
McCheapest, Taconomical, McBroken

Map guessing games
OpenGuessr
Virtual Vacation Guess

https://azgaar.github.io/Fantasy-Map-Generator/