MCEdit or Minecraft World Edtior is a minecraft map editor, it will allows you to construct anything by moving blocks around. You can select millions of blocks and clone them anywhere you want. This is what minecraft’s artist should have. Now, you can turn your idea into Minecraft World easier than before.
What’s new in Minecraft World Editor for Minecraft 1.5
MCEdit Stable 9
Added more brushes and clone settings
Fixed bug when undoing clone
Fixed incorrect entity positions
Suppresses some floating-point errors