spatial-indexing topic
h3net
H3NET: A Hexagonal Hierarchical Geo-spatial Indexing System In C#
h3-js
h3-js provides a JavaScript version of H3, a hexagon-based geospatial indexing system.
s2geometry
Computational geometry and spatial indexing on the sphere
h3
Hexagonal hierarchical geospatial indexing system
h3-java
Java bindings for H3, a hierarchical hexagonal geospatial indexing system
h3-go
Go bindings for H3, a hierarchical hexagonal geospatial indexing system
libspatialindex
C++ implementation of R*-tree, an MVR-tree and a TPR-tree with C API
h3-r
R bindings for H3, a hierarchical hexagonal geospatial indexing system
pgh3
PostgreSQL extension for the H3 hierarchical geospatial indexing system
h3jsr
Access Uber's h3-js library via R and V8 - https://uber.github.io/h3/#/documentation/overview/use-cases