[sligbad]

Also very cool: Google's S2 geometry - https://s2geometry.io/

Used by https://catch.astro.umd.edu/

[kybernetikos]

I used S2 to make https://wherewords.id/

It was very pleasant to work with - I spent by far the majority of the project time on the wordlist.

[sligbad]

I've seen some similar geohash-words stuff, this is super cool, thanks for sharing!