Mycorners
Don

Put decorative corners on blocks.

Parcdeco
Floatland

adds grass-like nodes that have flowers

More Mese Post Lights!
1F616EMO

Add more mese post light

Sundial
The4spaceconstants

Mostly game-independent sundial

NodeCore Nature: Revised
Warr1024

Updated, fixed, enhanced edition of Winter94's NodeCore Nature

CaT VoxeLibre Bleach
YCaTGameRT

Add bleach to discolor wool blocks

Columnia
mt-mods

Adds simple pillars and columns

Autobuilder
limafresh

Adds a GUI for building cubes with customizable width, height, and length.

Weedstone Random Mod Thing
chaosomnium

Originally meant to be a simple electronics type mod inspired by redstones, I messed around with the code after getting bored and got this weird mod, and now it's this thing. Enjoy I guess?

Directions
1F616EMO

Lines laying on the ground to guide directions

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

Letters
Amaz

Adds a letter cutting tool with letter "signlike" nodes.

Ocular Networks
mt-mods

Draw power from the world, and use it to power machines and tools.

Tinted Glass
1F616EMO

Colored glass

Template to Easily Make Fancy Voxelized Models
Noodlemire

Provides voxelmodel.obj, a model designed to be shaped by changing its texture, in order to easily create fancy voxelized models.

8Segmentdisplayblocks
unacceptium_core

8 segment digital display as blocks

NodeCore Vuga
Winter94

Generates Vuga Underground.

Beds for Minetest Classic
MyNameIsKid

Beds for Minetest Classic by MyNameIsKid.

nodeu
ulla

metal blocks stair railing coloured

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

Ehlphabet
1F616EMO

Letter blocks

Better Roads
DragonWrangler

allows players to make roads with less jagged edges

New bricks
DimonPy

adds 119 new bricks and grinder

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

Tac Nayn
GreenXenith

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

Minetest Emotions
ResendeTech

Adds new feelings in the form of blocks

Legendary Ore
DynamaxPikachu

Adds legendary ore and blocks

DragonEggLock
mi.sh

You can lock a Dragon Egg so it doesnt teleport away

Palisade
SFENCE

Add craftable palisades in many styles. Hades Revisited is supported.

Smart Renting
AiTechEye

Smart renting: Rent out your locked things and earn money!

Place Rotated
12Me21

Better slab/log placement

Item Replicator
ApolloX

Replicate items with ease.

My Blocks
Don

Special Blocks

Plasterwork
Sokomine

Add colored plaster coats to nodes

Zughy32 colored blocks
MisterE

Plain colored blocks from the Zughy 32 palette.

Plastic Box
Starbeamrainbowlabs

Adds a recolourable plastic box. Fork of @cheapie's version with improvements.

Color Cubes
Wuzzy

This mod contains several colorful abstract blocks for decoration.

Nodecore Stucco
Avicennia_g

Adds a few decorative building nodes to Nodecore through simple and crude masonry.

Barrier
erov

Barriers with optional placement restrictions.

Global Bulletin Boards
FaceDeer

Allows creation of global bulletin boards where players can post public messages