boomstick
fluxionary

a tool for testing the behavior of tnt

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

Grimoire
monk

Override tool functionality during runtime

Scripted World Editor
Neuromancer

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

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

Kits
Pyu

An API for creating kits

Minebase Core
ThatCommand

Adds APIs and new dynamic functionalities.

Debugging Console
sorcerykid

Provides an in-game HUD to easily monitor debug output

player actions
GigaByte

shows the actions of a player

Library Mount
Panquesito7

API Framework for mounting objects.