Underground Survival Lighting
Arkatron

If you like underground light in survival, use this mod, it can help that.

Exploding Chest
Coder12

Api-mod to allow containers like chest to explode if it contains explosive materials.

Blink
0siribix

Short distance teleport

Dice
Wuzzy

Decorative dice blocks which face a random direction.

TP Gate
AiTechEye

Teleport through the gate

Database Manager
AFCM

Database Manager API

Rivets
Silver Sandstone

Adds rivets for decoration or locking blocks.

Caps Alert
ANAND

Catches chat messages with all-caps and warns / kicks players.

group:any
1F616EMO

Item group applied to ALL items for crafting recipes.

Server News
Thresher

Shows players the server news when they log in

status effects
fluxionary

api for defining player status effects

VizLib
OgelGames

Visulization Library

Bitwise Operations
sorcerykid

A pure-Lua implementation of common bit-manipulation functions

Burnable Diamonds
Hume2

Make diamonds useable as fuel

Macro Crafting Manager
sorcerykid

Macro Crafting Manager provides a streamlined drag-and-drop interface for dividing and arranging item stacks within the craft-grid

Moth
iarbat

Adds moths which can send messages (from Lord of the Rings)

Modpol
ntnsndr

Framework that enables diverse governance processes

Node Placer Saving Tool
1F616EMO

Let admin know who placed a node

name monoid
fluxionary

flexible control of a player's nametag

mTimer
Linuxdirk

Ingame timer for showing current playtime, current day time, ingame time, etc.

MathPlot
kyleclaassen

A tool for constructing mathematical curves/surfaces/solids.

Configuration Pack
X17

Contains several node setting changes

Commons
tacotexmex

Abolishes private property by melting the solid chest locks into air.

Wicker Baskets
Winter94

Wicker Baskets, the early-game totes.

Vote Day
niwla23

This adds a command to vote for making day!

Ghosts
LMD

Adds fancy particle ghosts

Metatool
SX

Provides API to register node metadata tools along with few useful tools

One For All
mt-mods

bans all players if one dies

NodeCore 1 slot mod
Fanticwor

makes Nodecore 8 times harder by removing 7 slots from your inventory

balanced diet
fluxionary

api for specifying multiple dimensions to eating

Web chat
seckl

Makes the in-game chat accessible through a web browser.

Riddance
Blockhead

Hide or rid yourself of unnecessary items from games and mods without any code

builtin overrides
fluxionary

minor QOL overrides for some builtin behaviors

MineTest FileManager (MTFM)
Zemtzov7

Formspec-based file manager with text editor and image viewer

Minetest Systemd (API)
Piezo_

Debugging utility and compatibility tools for server owners and/or modpack creators

Localized Server News
ronoaldo

Display localized server news when a player joins

Online Craftguide
LMD

Generates a static craftguide website

Random (Useful) stuff
pl608

A library that adds well... Random Stuff

DataMiner
sorcerykid

DataMiner is an analytical tool for server operators with a feature-rich API for customized report generation

Brights
_Xenon

Adds bright stuff