Lava + Water > Stone
1F616EMO

Cool Lava into technically special stones for easier cleanup

Lookup Tool
Wuzzy

Adds a tool which shows help entries about almost anything which it punches.

Skygrid
ROllerozxa

Custom skygrid mapgen.

Multitools
ChimneySwift

Adds a series of multi-purpose tools

Infinite Chest
Dragonop

Adds a configurable chest that gives an infinite amount of something.

Coconut Trees
AwesomeDragon97

Adds coconut trees that appear on beaches

CodeBlock
giga-turbo

Use lua code to build anything you want

Bed Notifications
Bob64

This adds chat messages that tell other players when a player leaves or enters a bed and when players can sleep.

Compression
The4spaceconstants

Uses compression_api to generate compressed nodes.

vexcazer
AiTechEye

Ultimate build+mine & admin tool

Fancy Place
DragonWrangler

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

Candy
Kostivar

Adds candy which you can make from candy ores.

eXtended Ban 2
kaeza

Tempbanning and better banning by keeping track of usernames and IP addresses

Multiplant
Firefall

Grow Multiplants and get a random seed or flower!

Fast Build Tool
playduin

Tool for fast box building

Flow Extras
lazerbeak12345

An experimental collection of extra widget APIs for flow

Rename
niwla23

This Mod can rename Items

Trails
X5Dragonfire

Allows you to make paths in grass with ground roller

Titanium
Hybrid Dog

Adds titanium which is very strong and lasts for a long time.

Guinea pig
DrPlamsa

Adds guinea pigs.

replacer (flux's redo)
fluxionary

provides a node replacement tool and a node inspection tool. slightly different than the other replacer variants.

TP to Death Point
Sadistic Angela

Command to warp you to your death point instantly.

Axis Tools
mt-mods

All the functionality of tinkers construct, but all in your inventory.

AFK Kick
GunshipPenguin

Kick players who do not move for a while

Tides
markthesmeagol

Adds tides, WARNING: will delete water sources above sea level

Zinc
alerikaisattera

Zinc metal, used for making brass

Periodic Elements
ResendeTech

Adds the periodic elements

Falling Dirt
karlexceed

Makes dirt nodes fall just like sand and gravel.

Pedology
Wuzzy

Adds some different ground blocks in several wetness levels; the wetness slowly flows downward.

Rings
Goops

Add rings with temporary player effects

Missions
BuckarooBanzai

Adds blocks to create missions with rewards, timeout and penalties.

Areas' helper tools
rangeTonic

Convenient tools for Areas protection mod

Digiline Stats
Darin755

A mod that adds a few digiline blocks to get server information

golden_bread
MR_breaddz

golden bread

Stoneblocks
Homiak

Adds a range of stone blocks and lanterns that lit when player is close

Bonified
Shqug

New features related to the bones you get from dead players in MTG.

The Road (NC)
Winter94

This is a port of thelowerroad for NodeCore that adds a long road from -Z to +Z to the world, during world-generation.

ASCII Art Schematics
Warr1024

Manage Minetest schematics as ASCII art.

Ejection
Yof

A unique movement mechanic resembling strong jumping.

Reinforced Diamond Tools
ImAlreadyHere

A sword and a pickaxe that are really strong and can be crafted with diamond blocks and sticks.