WorldEdit
sfan5

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

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.

Digtron
FaceDeer

Adds components for building modular tunnel boring machines

Age of Mending
Sumi

Age of Mending: Sandbox game about building your own world and exploring a new one. Last breaking changes: a40

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

new minerals
GigaByte

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

Tower Crane
joe7575

A scaffold alternative for your building site

Torch Bomb
FaceDeer

Place torches throughout your entire surroundings with a torch bomb

Area Containers
jwmhjwmh

Adds nodes that contain areas in which you can build

Terraform
x2048

Adds terraforming tools to your creative toolbox

Randungeon
Phii

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

Industrious
StarNinjas

Adds new industrious-themed blocks and tools.

Streetbuilder
seckl

Build a street from given points

Research N' Duplicate
Noodlemire

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

Block Exchange
BuckarooBanzai

Cloud worldedit schema exchanger

The Build Spawner
Thunder1035

Gives build spawner for spawning builds which makes city creation easy

WorldEdit Additions
Starbeamrainbowlabs

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

Wrench
mt-mods

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

Pontoons
FaceDeer

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

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

Balloon Blocks
TBSHEB

Adds balloon blocks that can be placed on air.

Omnidriver
OgelGames

The ultimate screwdriver.

Imaging
entuland

An image / bumpmap importer mod

One of us
GigaByte

game of deduction and deception

Sane Tools
42tpac

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

Wings
xXNicoXx

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

Stripped Trees
1faco

Adds Stripped tree trunks.

Quarry Mechanics
kestral

Adds quarry mechanics to stone nodes.

Scaffolding
Semmett9

Adds wooden and Iron scaffolding.

Replacer
Sokomine

Exchange/replace nodes with one click.

Nodrown
Minisleep

Disables drowning, so you can swim and live underwater forever.

My Mason Hammer
Don

A hammer to make stairs, ladders and footholds

Fancy Place
DragonWrangler

Better block placement system that allows you to place blocks even when not pointing at the connecting face.

Camps
ApolloX939

Bring your base with you