Gaia eXtensions (GX) are integration's between Gaia and Third Party assets that make these assets "Gaia Compatible". Gaia eXtensions make it quicker and easier to create your game and can range from art assets such as terrain textures, grasses, trees and 3D models to shaders and tools which improve the visual look of your scene. If an asset has been mentioned here then it has been certified GAIA COMPATIBLE and I have personally vetted it to ensure that it works. Anything that is not in this list but which says it is on the asset store has not been approved by me and therefore is NOT Gaia Compatible.