WorldEdit Wall Block
SkyBuilder1717

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

Meseconometer
DS

Device to meassure time of mesecon signals in globalsteps

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

An API for automatically registering recipes, nodes and ore generation.

Scripted World Editor
Neuromancer

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