Crowdsourced COVID-19 Testing Map
https://covid19map.safecast.org/views/map
Safecast is/was a group of folks from Japan who made a cheap, mobile radiation meter that people all over Japan used right after FuckYouShima. Other folks bought them to take baseline radiation samples, gps tagged, for upload. Made a big radiation map of the world.
Now they're doing self-reported COVID-19 testing results.