[captare]

I’ve used the excellent DGGRID for building geo-hex grids: https://github.com/sahrk/DGGRID

[JakeStone]

DGGRID was very useful for me when I first started experimenting with hexagon partitioning.

One of my projects is using the Dymaxion projection, which H3 uses, and I've found H3 to be a lot faster for my uses. YMMV.