A procedural dungeon generator for Minecraft
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