Math blocks
Giulio

Adds decorative math blocks to help in teaching

TurtleMiner
BirgitLachner

A Mod to let Kids start programming with a turtle that can move around in the world, and dig and build what the user wants.

nodeu
ulla

metal blocks stair railing coloured

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)

Tac Nayn
GreenXenith

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

My Torches
Don

Changes default torches to ones that burn out and cause damage

Sugar
X17

Adds eatable sugar made of papyrus and a sugar block

Engravings
Taren

Adds multiple engraved blocks and benches to make them.

Bows
AiTechEye

A easy bow mod with arrows

More Ladders
SkyBuilder1717

Adds more ladders and sticks!!!

Spectator Mode
jp

A mod for Minetest allowing you to watch other players in their 3rd person view.

Stairs Recycle
DumbDave961

Turn stairs into ingots, slabs, or different stairs. Smelt cobble stairs into stone stairs. Highly recommended for Oneblock survival. Based on Simple Recycle by Jolesh.

Scripted World Editor
Neuromancer

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

Hexagonal
GreenXenith

Proof of concept for hexagonal nodes

Bank Accounts Receipt
Can202

Receipt = TRASH

Random (Useful) stuff
pl608

A library that adds well... Random Stuff

Area-Locked Chests
1F616EMO

Locked chest that check protections

GC Gamemode
stellarorion

Easily switch between the survival and creative inventory

LW Wires
mt-mods

Wires and bundle cables.

Boots of Swiftness Mod
ClothierEdward

Adds a new pair of boots called the Boots of Swiftness.

Additional Gravel
Hordeking

Adds overgrown gravel, similar to mossy cobblestone.

Realm Lamp
GenesisMT

A rainbow gradient block for decoration and with differents speeds.

My White Block
Don

a white block

Prop Hunt Modpack
Jo5629_

Transform into nodes and with a minigame.

Trophies
sorcerykid

Showcase player achievements with a personalized gold cup

Hbdrunk
UnchainedDevelopment

Adds intoxication effects and HUD bar to display intoxication level.

Nextgen Compass
StarNinjas

A compass item which points towards the world origin.

Spawn redo
cathaya7d4

Drop-in replacement for default/spawn for more third-party biomes

More Coral
Nathan.S

Adds coral in more colors.

blueberry_juice
MR_breaddz

blueberry juice

Randomized Map-specific Ores
Piezo_

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

TNTTag
debiankaios

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

Beautiful Boulders
regulus

Procedurally Generated Rocks with (pretty) Accurate Collision Boxes

Dirt Tunneler
Neuromancer

Makes dirt deeper and you can tunnel through it just by walking through it. Press spacebar/shift to tunnel upward/downward with auto placed ladders.

Library Mount
Panquesito7

API Framework for mounting objects.

MadKamel's Random Mod
MadKamel

A collection of random items and ideas.

Strong Wooden Pickaxe
mufigilang

Add strong wooden pickaxe that destroy stone as fast as diamond pickaxe

Dyeable Steel Blocks
nemokitty9

Allows Players to dye Steel for decorative blocks.

Kill history hud
GigaByte

adds a death history on the screen

Frames
opfromthestart

Frames from Technic since it was removed.