WorldEdit
sfan5

In-game world editor. Use it to repair griefing, or just create awesome buildings in seconds.

Digtron
FaceDeer

Adds components for building modular tunnel boring machines

I Have Hands
SURV

Carry nodes/blocks with inventories without breaking them.

Skyblock: Zero
zanderdev

Start from absolutely nothing in a skyblock world. Time is your resource.

Edit
Johannes Fritz

Allows copying, pasting, filling, deleting, replacing and saving 3D areas

Placement Preview
SURV

shows a preview with orientation of the node the player is holding.

Unified Dyes
mt-mods

Unified Dyes expands the standard dye set from 15 to up to 256 colors (depending on the object to be colored)

Better Screwdriver
12Me21

A more intuitive node rotation tool

Terraform
x2048

Adds terraforming tools to your creative toolbox

Torch Bomb
FaceDeer

Place torches throughout your entire surroundings with a torch bomb

Tower Crane
joe7575

A scaffold alternative for your building site

Area Containers
jwmhjwmh

Adds nodes that contain areas in which you can build

new minerals
GigaByte

new minerals for armor and tools,add mineral abysmal, cobalto,adamantita,tugsteno,clorofite,titanium and more uses for obsidian

Randungeon
Phii

adds highly randomized vivid dungeons to the world, and tools to spawn/customize them.

Streetbuilder
seckl

Build a street from given points

Industrious
StarNinjas

Adds new industrious-themed blocks and tools.

Extruder Tool
fgaz

Adds an extruder tool that can extend continuous surfaces towards the node face that was clicked

Research N' Duplicate
Noodlemire

Obtain and research enough of a specific item to unlock the ability to infinitely duplicate it.

VoxelForge Beta - Hidden Mysteries Update
VoxelForge

Build, Fight, Mine, and so much more. A MineCraft Inspired game, focused on replicating MineCraft as good as possible while keeping performant.

WorldEdit Additions
Starbeamrainbowlabs

Extra tools and commands to extend WorldEdit. Currently has over 70 commands!

Pontoons
FaceDeer

A "floating" block that can be placed at the surface of a body of water without needing to build pilings first.

Block Exchange
BuckarooBanzai

Cloud worldedit schema exchanger

Wrench
mt-mods

Adds a wrench to pick up nodes with inventories, such as chests, and transport them to another location.

Stone Age Integration Pack
csirolli

Adds basic stone age & survival tools and makes the start in the world harder

mcl_edit_signs
cora

Edit signs in mineclone2

Visual Bots
Nigel

Visually programmable turtle bots

Omnidriver
OgelGames

The ultimate screwdriver.

Imaging
entuland

An image / bumpmap importer mod

The Build Spawner
Thunder1035

Gives build spawner for spawning builds which makes city creation easy

Wings
xXNicoXx

Wings is a mod whiche allows server owners to give players fly privs while holding the wings (Like binoculars) made by xXNicoxx

Sane Tools
42tpac

Adds a 3x3 hammer, a one layer wand builder and a one layer scraper

Cozy Lights
SingleDigitIq

Early alpha. Improves the way light sources(torches etc) behave and allows to create huge lights, literal projectors with just a mouse click, light map will be computed for you.

Stripped Trees
1faco

Adds Stripped tree trunks.

Replacer
Sokomine

Exchange/replace nodes with one click.

My Mason Hammer
Don

A hammer to make stairs, ladders and footholds

Quarry Mechanics
kestral

Adds quarry mechanics to stone nodes.

Better Locks
SkyBuilder1717

Adds locks and locked doors

Scaffolding
Semmett9

Adds wooden and Iron scaffolding.

Extended Placement
gamefreq0

Allows placing nodes below/behind the closest node to where you are looking, when you're looking at the air where said node would go.

Nodecore Paint
Kimapr

Paint anything on node surfaces