MCDungeon is a map editing tool that will create procedurally generated dungeons in a preexisting Minecraft map. It is written in Python and makes use of code from Paul Hodge's minetown, the MCEdit/pymclevel project, the Minecraft Overviewer project, and was inspired by BeeTLe BeTHLeHeM's MCMapper.

• Source code and info at the Github project site
  
• Downloads
  
• Documentation
  
• Help and support at the Minecraft forums thread
  

IRC: You can occasionally find me on #mcdungeon at irc.esper.net.

• Dynmap markers plugin from sshipway
• KivyNBT An NBT editor geared towards MCDungeon from Kovak