Tutorials/Programs and editors/Mapping

Mappers
Overhead mappers create a visual map of your world's terrain. Many mappers have options for different overhead and angled modes, and some will limit the map to selected block types or slice the map into smaller pieces.

Map Viewers
Map viewers are read-only and have an interactive interface.

Map Editors
Map editors alter an existing level's terrain or other properties, such as player position and time of day. Some of them also let you edit your inventory and generate terrain.

Map Generators
These programs will either create a new level with custom terrain, or "implant" new blocks into an existing level.

Bugs

 * If you edit in a block that is not yet added in the game, eg: hardened clay, it will say instead 'future block!' and it will so a missing texture pack block. If it is hacked in, then the world with it will crash over and over again until the server updates it to the version with it or the offending block is removed with a map editor.

More bugs
辅助程序与编辑器/地图工具 Programme und Editoren