It's Photo Realism pack with few mod support.
Easiest way to get it know is to try it.
Games support * Minetest Game (focused on) * MineClone 2 (partially)
Mods support: * Ethereal * Farming * More Trees * More Ores * Baked Clay * Flowers * Crops * Hardened Clay * Basic Materials And a lot more.. :)
This texture pack is still in development, but pretty playable.
License is Free License, except content used "with author permission" from: "hdx-64-master" texture pack from "VanessaE" where is: CC-By-SA / GPL .