Wrench - node rotation tool
Argos

A better screwdriver.

Exile Roof Ridge Tiles
Oz

Adds a dedicated roof ridge tile for Exile builds.

Waste
Jolesh

Adds Waste and ways to recycle it into useful resources

Node roads
MatyasP

Add much of one-node roads and crossroads, road bridges and slopes

Quest Framework
TeTpaAka

Simple framework to define quests.

Archipelago for Piranesi
Warr1024

Connect Piranesi Restoration Project to Archipelago Multi-world Randomizer

Example Lua mapgen
ROllerozxa

A basic example for writing custom Lua mapgen using Perlin noise.

WiTT
MightyAlex200

Small indicator to show what the player is looking at.

FS51
Luke

Compatibility layer for formspecs

World Borders
argyle

Add impenetrable barriers to the sides and bottom of the world.

Mid Measure
ANAND

Quickly get the distance between two nodes and calculate their mid-point

MineClone2 Build Limit
AFCM

Add a build limit to MineClone2

Classic Coaches Nationality Livery Pack
Marnack

Additional nationality themed liveries for use with the Classic Coaches mod.

Bed Jumping
playduin

You may jump on the bed

List Items Chat Command
AntumDeluge

Chat command that lists registered items & entities.

City CommodityMarket
X5Dragonfire

Adds simple CommodityMarkets for city's towns etc.

name monoid
fluxionary

flexible control of a player's nametag

Nebula Combat
JoinNebula

A combat customizer for competitive servers: customize knockback, attack interval, attack distance, damage multiplier, etc.

Mailbox
1F616EMO

Inbox for items

Sling
tacotexmex

Sling enables item stack and single item throwing of any item.

Scripted World Editor
Neuromancer

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

Admin mailing list and report
1F616EMO

Add mailing list for admins and moderators, and a report function

Sneeker
AntumDeluge

An explosive nuisance.

NodeCore Bugs
Winter94

Adds A Variety Of Bugs To NodeCore

CentralAuth
1F616EMO

Player account unification across Luanti servers

action queues
fluxionary

provides an API for queuing things for batch processing w/ various ways to specify the batch "size".

Resistor Anthems
Astrobe

Background music (chiptune/8bit-like)

Obdy
Sires

Adds some pretty OP tools :)

Fake Solids
Holly Mae

Creates fake blocks that can be walked through.

More Mese Post Lights!
1F616EMO

Add more mese post light

Pencil Redo
1F616EMO

Tool to edit infotext of nodes

Pizzas and cakes - pack 1 (square)
MatyasP

add square pizzas, pack 1

Easter Eggs / Ostereier
Ineva

Adds various coloured eggs for Easter!

Palamod
AFCM

Palamod modpack for MineClone2

Valentine's day
Luke

Adds valentine cards

Seasons Clock
solsword

API for getting various "season" parameters based on server time and a few customiable settings. Doesn't change gameplay; just a library that other mods can use to do seasonal things.

hand_monoid
fluxionary

player monoid for controlling the look and abilities of the player's hand.

Offline Phantoms
Kimapr

Players leave "phantoms" when leaving; other players can take items from those

Playerhealth
Simon

fill your hearts (HP)

warn
Neocraft1293

simple mod to warn players