New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Engravings
Taren

Adds multiple engraved blocks and benches to make them.

Handholds
Shara

Adds a climbing pick which creates handholds in stone, desert stone, sandstones and ice nodes.

Card deck
mijutu

Deck of cards and table blocks

Technic Recycle
DumbDave961

Recycling recipes for Technic items.

Top players
GigaByte

Adds a kill, deaths, and kd counter to players.

gooey mess
timm

a funny addon that is a goofy time

Hoverboard
mazes

Hoverboards

Additional Gravel
Hordeking

Adds overgrown gravel, similar to mossy cobblestone.

Tables
AwesomeDragon97

A simple mod that adds decorative wooden tables.

Sticks Stones
MikeRedwood

Makes Sticks from leaves and scatters small stones

Randomized Map-specific Ores
Piezo_

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

Shears
Atlante

This mod adds a pair of shears to easily cut foliage, flowers, wool etc.

Batmod
Don

Fun mod that is about bats

Scripted World Editor
Neuromancer

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

Fire extinguisher
SkyBuilder1717

Adds fire extinguisher, which can extinguish some fire

Kitty/Kitto Ores
nemokitty9

Nemokitty9's own ore pack. Includes Tools!

Shadow Realm
archfan7411

The realm of shadows contains many hidden horrors.

Travelnet Redo: Beacons
1F616EMO

Travelnet components in Telemosaic style

Atium
GenesisMT

A strange a ore with tools.

Cthulhu eye boss
GigaByte

Cthulhu eye boss adds

3D Spikes
BryanGruik15

Adds spikes to the game.

morebiomes
mzs.112000

A simple mod adding a few biomes to Minetest Game

My Numbers
Don

Numbers and math signs

My Regen Chest
Don

Spawns items when opened and will not again for determined amount of time

Mycorners
Don

Put decorative corners on blocks.

Underground Survival Lighting
Arkatron

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

Pineapple
Neuromancer

Pineapple crop for tropical biomes

Respawn Kit
Deadlock

Adds a "respawn-kit"-Chest. A Copy of everything you put in it, will be given to you on respawn. (With configurable Black/White-List)

Dyeable Steel Blocks
nemokitty9

Allows Players to dye Steel for decorative blocks.

Bows
AiTechEye

A easy bow mod with arrows

Item exchange shop
Krock

Provides a simple exchange shop (currency compatible)

Oil lamps
ademant

Create oillamps with oil from leaves (basic_materials) or create oil with seeds.

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

Meseconometer
DS

Device to meassure time of mesecon signals in globalsteps

Startest
Robot10&Scheletor

This mod adds several space stuff to the game.

Uncrafter
JoeEnderman

Adds an uncrafting table

Color Blocks
mt-mods

Contains colored building blocks.

Throwable Snowball
ComputeGraphics

Adds a throwable Snowball

Item Holders
Jose_ManuelS18

Adds 'Item Holders', blocks that hold your items in display, also provides a API.