I have wanted to learn more about how voxel engines work, and have gotten to a place where something actually happens.
For now I call it Grid World (since it's a world based on a grid)
https://github.com/JeffM2501/GridWorld
It written in C# using UrhoSharp
I still have a lot to do an a lot more to learn and hope I can keep up work on it.
It supports static and procedural generation as well as a clustering, sliding origin and 64 bit block addressing, giving a theoretical area of 18.4 square Exameters of world space (just under 2000 square light years). Probably overkill, but it only added 8 more bytes per cluster.