Surprise Blocks
Wuzzy

Randomly spawns surprise blocks closely about ground level.

Saphire
Ryft77

Adds saphire stuff

Protector Redux
sorcerykid

An efficient and flexible node-based protection scheme for multiplayer worlds

Atium
GenesisMT

A strange a ore with tools.

More Ladders
SkyBuilder1717

Adds more ladders and sticks!!!

Shears
Atlante

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

bridgemaker
mike.monkeybiter

A refillable machine to easily create simple block bridges across caverns and valleys.

Giftbox2
Wuzzy

Gift boxes that players can give to other who will then receive random items

obsidian
GigaByte

more uses for obsidian

Tac Nayn
GreenXenith

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

Pink Lava
TenPlus1

Adds pink lava to certain depth of map with new mahogany obsidian block

New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Claymore
GigaByte

adds a powerful sword capable of deforming the ground

Engravings
Taren

Adds multiple engraved blocks and benches to make them.

Simple Shooter
stu

First person shooter mod.

Nextgen Compass
StarNinjas

A compass item which points towards the world origin.

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

Hbdrunk
UnchainedDevelopment

Adds intoxication effects and HUD bar to display intoxication level.

Horsetail++
TX Miner

Lets you eat Horsetails from Paleotest. Very helpful in caves!!!

More Mese Post Lights!
1F616EMO

Add more mese post light

Tree Particles
SuperStarSonic

Adds particles of falling leaves when you punch a tree

Cute Pie
Don

Cute blocks

Gems Battle
MisterE

Bedwars-like team battle minigame

Alien Tools
chaosomnium

Alien Tools Mod for Minetest - adds Alien Tool, Shield, biome, etc

Fareboxes and Faregates
1F616EMO

Signal-emitting fareboxes and faregates

Rainbow Source
Shara

Adds coloured water.

Frames
opfromthestart

Frames from Technic since it was removed.

TNTTag
debiankaios

A player is holding TNT which is about to explode; they must tag other players to get rid of it

Lava + Water > Stone
1F616EMO

Cool Lava into technically special stones for easier cleanup

Better Ice
TheFanne

Modifies ice so that it melts into water when broken, and will be melted by torches

GetName
kevins

Adds an API and tool to generate random names for NPCs, mobs, and places.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

doorbell
Miniontoby

A doorbell mod with sound

Roadway
X17

Adds simple roads in 4 sizes.

WorldEdit Wall Block
SkyBuilder1717

Adds block and item for making big structures easily as possible.

Maple tree
Duvalon

Adds a maple tree placed during world generation.

New Biomes
Arkatron

If you like underground biomes, this thing is for you.

Ethereal: All-faces tree blocks
1F616EMO

All-faces tree block for Ethereal trees

Item exchange shop
Krock

Provides a simple exchange shop (currency compatible)

Loot
Byakuren

A loot framework.