WorldEdit CUI Forge Edition Mod supports a client-side user interface for the WorldEdit plugin that enable player to have a look at their chosen area in-game in real time. Additionally, the mod permits them to work more quickly and accurately with WorldEdit selection and fiercely beneficial when working with Polygon, Convex Hull and Cylinder selections.
To use WorldEdit CUI Forge Edition mod, simply make a selection on a server using WorldEdit, your selection will be instantly displayed on the screen. To clear your current selection issue the command //sel
For 1.7.10
http://dl.niceminecraft.net/download.php?file=e888a202fb59c075c936298c7cb707b3
For 1.8.9
http://dl.niceminecraft.net/download.php?file=9f3725b2ba27b45f314f8c6c02aa358b
For 1.9
http://dl.niceminecraft.net/download.php?file=ee416f18e900c94d79d05d8478d8d103
For 1.9.4
http://dl.niceminecraft.net/download.php?file=f0d6c5d50254d86f596d53d4c4492df5
For 1.10.2
http://dl.niceminecraft.net/download.php?file=98f4104d4e4dc388d594a9c5e6853e1f
For 1.11
For 1.11.2
For Minecraft 1.12.2
Credits: hexosse