WorldEdit CUI Forge Edition Mod for Minecraft 1.9/1.8.9 provides a client-side user interface for the WorldEdit plugin allowing you to see your selected region in-game in real time. It allows you to work more quickly and accurately with your WorldEdit selection and is especially useful when working with Polygon, Convex Hull and Cylinder selections.
Download link: WorldEdit CUI Forge Edition Mod for Minecraft 1.9/1.8.9