Pro Atmo is an environment and atmospheric lighting addon divided into multiple standalone extensions that can also work together. The tool allows users to generate atmospheric setups, including realistic skies and sunsets with multiple cloud layers. It also includes generators for space scenes, featuring Earth-like planets, planetary rings, galaxies, and nebulas. Additionally, the addon comes with a Cumulus Clouds Asset Pack containing 30 high-detail VDB files that integrate directly with the atmosphere system.