Unity level design pipeline assets

UnityAssests

# Modeling
ProBuilder
UModeler - https://assetstore.unity.com/packages/tools/modeling/umodeler-80868
Gaia https://assetstore.unity.com/packages/tools/terrain/gaia-pro-terrain-scene-generator-155852
Digger - https://assetstore.unity.com/packages/tools/terrain/digger-pro-149753


# Texures
Quixel - https://assetstore.unity.com/packages/tools/terrain/digger-pro-149753?q=quixel&orderBy=0
Quixel - https://quixel.com/pricing
Quixel Mixer - https://quixel.com/mixer

OR

Substance Painter - https://www.substance3d.com/products/substance-painter/
substance Designer - https://www.substance3d.com/products/substance-designer/

# Skybox
HDR collection - https://assetstore.unity.com/packages/2d/textures-materials/sky/hdr-collection-118509

# Post processing 
AURA 2 - https://assetstore.unity.com/packages/tools/particles-effects/aura-2-volumetric-lighting-fog-137148
Post Processing Stack

# Optimization
SimpleLOD - 
Amplify Imposters - https://assetstore.unity.com/packages/tools/utilities/amplify-impostors-beta-119877
Bakery - GPU Lightmapper - https://assetstore.unity.com/packages/tools/level-design/bakery-gpu-lightmapper-122218