WorldEdit - Minecraft MOD
MCEdit
Schematica - Minecraft MOD
Litematica
WorldPainter
MCA Selector
WorldGuard - Minecraft Plugin
Amulet Map Editor
Vim Python IDE
Vim Python IDENo features have been listed yet.
MCEdit - MCEdit is an open source world editor for the popular game Minecraft.
Schematica - Minecraft MOD - With this mod you're able to display a ghost image of a schematic file inside Minecraft to rebuild a structure or export any part of your world (or a server's world) into a schematic file. You're able to export parts of your world, too!
Litematica - A modern client-side schematic mod for Minecraft
WorldPainter - WorldPainter is an interactive graphical map generator for the game Minecraft. It offers tools similar to those of a normal paint program to shape and mould the terrain, paint materials, trees, snow and ice, etc. on top of it and much more.
MCA Selector - A tool to select chunks from Minecraft worlds for deletion or export.
WorldGuard - Minecraft Plugin - WorldGuard is a powerful plugin with a large bag of tricks for server owners, server map makers, regular survival servers, and everyone in between!