WorldEdit Wall Block
SkyBuilder1717

Adds block and item for making big structures easily as possible.

Protector Blocks for Area Protection Mod
1F616EMO

Protector Block, but using the Area Protect APIs

Server Essentials
jolethen

An essential mod for any server

Scripted World Editor
Neuromancer

API that allows you pass in scripting tables to fill a series of shapes of different sizes with different nodes

Anti Lava Area
1F616EMO

give admin power to anti lava in some region.