https://blendermarket.com/products/easy-15

 Introducing Easy Clouds, your go-to tool for creating stunning, volumetric clouds in Blender. This tool is designed to make the process of creating realistic clouds and fog as simple as possible, regardless of whether you’re working on a cinematic masterpiece, a 3D animation, or a single render image. This add-on transforms your meshes into customizable 3D volumetric clouds. It’s incredibly user-friendly, allowing you to apply it to an entire collection. But don’t restrict yourself—this tool is both easy and efficient, motivating you to incorporate volumetric effects into all your projects. Whether it’s smoke, fog, or any other cloud-like shape, this add-on has you covered.