Georgie writes:
Blender comes with powerful built-in procedural environment setups. Few, however, know how to use its full potential. With CEL (Citigen Environment Lighting, a part of the Citigen addon) you can do just that. CEL may be the first addon that provides a "usable" 360-degree procedural volumetric sky to Blender users. Available at Blendermarket, Gumroad, and citi-gen.com.