Replacer
Sokomine

Exchange/replace nodes with one click.

Ranged Weapons
davidthecreator

Adds some guns and throwable weapons.

Quartz
Evergreen

Adds quartz ore and some decorative quartz blocks

WorldEdit
sfan5

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

Map Tools
Calinou

Adds various special versions of normal blocks, tools, and other map maintainer tools.

Flowerpot
sofar

A stylish flowerpot that can contain most plants.

Fancy Vend
ChimneySwift

A full-featured, fully-integrated vendor mod for Minetest

HUD bars
Wuzzy

Replaces the default health and breath symbols by horizontal colored bars with text showing the number. Extensible.

Easy Vending Machines
Wuzzy

Adds vending and depositing machines which allow to buy and sell items from other players, using a currency item.

Digtron
FaceDeer

Adds components for building modular tunnel boring machines

Gloop Blocks
VanessaE

Adds decorative and functional blocks, including cement, rainbow blocks, "evil" blocks, and tools.

X-Decor
jp

A decoration mod meant to be simple and well-featured.

GloopTest Pack
GloopMaster

Adds a collection of things into minetest. As it stands, this adds three different modules.

Plantlife
VanessaE

Adds various kinds of plants, fruit bushes, fallen trees, and a whole host of foliage and other ground cover.

More Trees!
VanessaE

Adds a whole bunch of new types of trees, some bearing fruit or similar, using biome_lib for the placement engine.

Coloredwood
VanessaE

Colorize some wood!

Biome Lib
VanessaE

The biome spawning and management library.

Mobs Monster
TenPlus1

Adds many types of monster.

Baked Clay
TenPlus1

Adds the ability to bake clay into blocks and colour them with dye.

Basic Machines
rnd

Lightweight minetest automation mod/logic/electronics building.

Protector Redo
TenPlus1

Lets players craft special blocks to protect their builds or disable PVP in areas.

Fireflies
Shara

Adds fireflies which can be caught in a net and placed in bottles for lighting.

Useful Contraptions
theFox

Some useful contraptions / machines.

Journal
theFox

Do you want to add story to your game? Make your protagonist write notes into his Journal.

Lightning
sofar

A mod that adds thunder and lightning effects.

sfinv
rubenwardy

A cleaner, simpler solution to having an advanced inventory

Snowdrift
paramat

Light-weight weather mod with snow, rain, and clouds.

Weather
theFox

A weather mod for minetest.

Working villages
theFox

A mod adding villager NPCs that are doing predefined work.

New Factory
theFox

Industrialization for minetest

Pumpkinspice
GreenXenith

Adds pumpkinspice stuff.

Halloween
GreenXenith

Adds Halloween candy and costumes.

Mobs Animal
TenPlus1

Adds farm animals.

Christmas Decor
GreenXenith

Christmas-themed decor

Mobs Redo
TenPlus1

Adds a mob api for mods to add animals or monsters etc.

Crops
sofar

This mod expands the basic set of farming-related crops that minetest_game offers.

Tac Nayn
GreenXenith

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

Caverealms
HeroOfTheWinds

A mod for Minetest to add underground realms.

More Ores
Calinou

Adds new ore types.

Abriflame
Shara

Adds coloured fire through use of fire starter tool.