Improves sky colors, cloud textures, and water reflections to give the environment a more natural feel. Where to Find Them? Most of these are hosted on the X-Plane.org Forum or developer-specific sites like Best free addons - XP11 General discussion
: Replaces standard runway and taxiway textures with high-definition versions to make default airports look more modern. Where to Find and How to Install x plane 11 addons freeware
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The Ultimate Guide to Essential Freeware for X-Plane 11 Even years after its release, X-Plane 11 Improves sky colors, cloud textures, and water reflections
: A tool that converts real-world satellite imagery into high-detail ground textures. Improves sky colors
Plugins are the "engine room" of your simulator, adding features that the base game often lacks. X Plane 11 Free Addons - Google Groups