The mods present in the screenshot are BetterNether & Biomes O' Plenty, and the shaderpack used is Complementary Reimagined.
All these mods wouldn't normally be compatible, but are through Nether API! The shaderpack used in the screenshot is Complementary Reimagined
Can now carve through biome top/filler blocks, as well as soul sand! The biomes in the screenshot are from Biomes O' Plenty and NetherEx
Stygian End biome generation with Nether API (notice the trees in the background look different than normal, and only the vanilla biome has chorus plants). The shaderpack used is Complementary Reimagined
A screenshot of NetherEx's Arctic Abyss biome with a custom fog color (set by this mod's `NetherAPIFogColorEvent.Nether` event via GroovyScript). The shaderpack used is Complementary Reimagined
A screenshot of NetherEx's Ruthless Sands biome with a custom fog color (set by this mod's `NetherAPIFogColorEvent.Nether` event via GroovyScript). The shaderpack used is Complementary Reimagined
Journey Into The Light uses a pseudo-biome system, this mod removes that and replaces it with real biomes!
BetterNether uses a pseudo-biome system, this mod removes that and replaces it with real biomes!
The biomes in the screenshot are from BetterNether, Biomes O' Plenty, and NetherEx
A cave leading to a village structure from NetherEx
Biome is from Biomes O' Plenty

A library mod for adding End and Nether biomes or structures, and for creating new biome ambience!