Blazingly fast world manipulation for artists, large networks and developers: https://www.spigotmc.org/resources/13932/
FAWE is a fork of WorldEdit that has huge speed and memory improvements and considerably more features
It is available for Bukkit, Forge, Sponge and Nukkit.
FAWE uses gradle to build
$ gradlew setupDecompWorkspace
$ gradlew build
Have an idea for an optimization, or a cool feature?