Tac Nayn
GreenDimond

Adds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).

Mobs Snow Walkers
Hamlet

Adds the Snow Walkers mobs, and an obsidian sword.

Pontoons
FaceDeer

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

Round Tree Trunks
Hamlet

Turns (default) cubic tree trunks into cylindrical.

Cloaking
luk3yx

Allows players to cloak and uncloak, inspired by Star Trek's cloaking device.

WorldEdit HUD Helper
Starbeamrainbowlabs

Displays the name of the node you're looking at & your rotation in your HUD. Banish the debug text forever!

Bell
Sokomine

A bell that sounds each hour - like a historic bell in a church or town hall

Sweet Foods
rubenwardy

Adds cakes, buns and tarts.

Agree rules
AiTechEye

Agree rules or be kicked

Street Signs
VanessaE

Adds street signs of all kinds, many with editable text or numbers. Sizes, colors, and content are generally MUTCD 2009 compliant.

Mobs Wolf
Hamlet

Adds wolves.

Basic Houses
Sokomine

Simple random houses spawning in small groups on the map

Utilities for Underch - extension pack
Hume2

Extend the Underground Challenge by miscelaneous utilities and change some recipes

Randomized Map-specific Ores
Piezo_

Adds two randomly created ores to each world with varying properties depending on the world's seed

MultiHome
octacian

Allows setting a configurable number of home points in a world.

Better Fences
ChimneySwift

A Minetest mod which improves the usability of fences by making fences which connect to less than 2 other fences connect to all nodes.

Parkour Survive
AiTechEye

Parkour ability!

SmartFS
rubenwardy

A library to allow mods to make Formspecs, a form of GUI, easily.

Laptop PC Pack 1
GamingAssociation39

This is an addition to the laptop mod.

Armor HUD bar
Wuzzy

Adds a HUD bar displaying the current damage of the player's armor.

Mahogany Tree
runs

A jungle tree.

Burnable Diamonds
Hume2

Make diamonds useable as fuel

Hopper
FaceDeer

Adds hoppers to transport items between chests/furnace etc.

Barchairs
Clyde

Adds some Barchairs.

Airtanks
FaceDeer

Provides pressurized air tanks for extended underwater excursions

Stack Slabs
TumeniNodes

stackable slabs for Minetest

Agriculture
jbb

Adds many useful farming plants

Obdy
Sires

Adds some pretty OP tools :)

sfinv
rubenwardy

A cleaner, simpler solution to having an advanced inventory

Stoneworks
TumeniNodes

Stoneworks simply adds some fun, and cool building options to Minetest.

Blueprints
luk3yx

Allows Minetest players to easily copy+paste nodes.

After Earth
AiTechEye

The earth's ecosystem has collapsed, and there ain't no biologically environment left.

Locked Travelnet
Sokomine

Protect travelnet stations with locks and/or passwords

Edutest
zeuner

Provides a GUI frontend for the educational staff.

Beacon in Block
Chiantos

Mix of 2 mods : Beacon and Block in block

Hard Trees
octacian

Require tools to break trees and introduce beginner-tier rock tools.

Serverguide
AiTechEye

The serverguide

Filter
sofar

A chat filter for servers.

Ropes
FaceDeer

Adds rope boxes of various lengths and also rope ladders.

Teaching Mathmatics
sfan5

Adds nodes to create a mathematical expression, and then a solution checking node which can output a reward