WorldEdit is an in-game map editor with over 100 functions that makes building and fixing really fast with three types of tools: https://dev.bukkit.org/projects/worldedit/
Command Reference
http://wiki.sk89q.com/wiki/WorldEdit
https://github.com/downloads/sk89q/worldedit/worldedit_ref_rev6.pdf
Permissions
http://wiki.sk89q.com/wiki/WorldEdit/Permissions
g:worldedit_admin:
permissions:
- worldedit.*
Download
http://dev.bukkit.org/media/files/584/140/worldedit-5.3.zip (1.2.5 R1.0)