My Wood Slopes
Don

Make slopes with wood blocks.

ColoredCement
Truemmerer

Add Cement Blocks with unifieddyes support

Aquamarine
RasPiManiac

Adds Aquamarine ore, ingots, etc.

Better Ice
TheFanne

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

Colored Sand
LoneSurvivr

Adds dyed variants for the default sand.

Banners
Anonymous_moose

Adds decorative banners in all colours of wool.

Gates (wider)
Sokomine

Wide gates for easy walking through and keeping cattle inside

Ethereal: All-faces tree blocks
1F616EMO

All-faces tree block for Ethereal trees

My Blocks
Don

Special Blocks

More Snow
Sokomine

snow and wool for stairs - nicer winter landscape and snow-covered roofs

Pink Lava
TenPlus1

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

Legendary Ore
DynamaxPikachu

Adds legendary ore and blocks

Rainbow Source
Shara

Adds coloured water.

Glostone Building Blocks
Wovado

Adds basic glostone-based building materials

Autobuilder
limafresh

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

Zughy32 colored blocks
MisterE

Plain colored blocks from the Zughy 32 palette.

New Horizons
Hi_World

Adds 4 new biomes and TONS of new blocks!

Ethereal Mosses
1F616EMO

More mosses for dirt types in Ethereal NG

Lapis Lazuli
LNJ

Adds lapis lazuli ore, items and blocks.

Signlike letters
limafresh

Adds sign-like letter nodes.

Node houses
MatyasP

Node houses is a mod by MatyasP that adds one-node block of houses, for crafting using items from mode default.

Color Blocks
mt-mods

Contains colored building blocks.

Floating Anchor
Starbeamrainbowlabs

ExtraUtilities' Angel Block for Minecraft in Luanti! Place structures in mid-air with ease.

More Ladders
SkyBuilder1717

Adds more ladders and sticks!!!

Parcdeco
Floatland

adds grass-like nodes that have flowers

Stoneworks
TumeniNodes

Stoneworks simply adds some fun, and cool building options.

Maple tree
Duvalon

Adds a maple tree placed during world generation.

Kotatsu Tables
Piezo_

Adds a new piece of furniture based on Japanese kotatsu tables

My Mulch
Don

Turns leaves and other items to mulch blocks

More Mese Post Lights!
1F616EMO

Add more mese post light

Mycorners
Don

Put decorative corners on blocks.

Saphire
Ryft77

Adds saphire stuff

Tile Floors
ClassicAdam

Various colors of tile flooring in 16px and 256px res

WorldEdit Wall Block
SkyBuilder1717

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

Useful Contraptions
theFox

Some useful contraptions / machines.

Better Locks
SkyBuilder1717

Adds locks and locked doors

Dyeable Steel Blocks
nemokitty9

Allows Players to dye Steel for decorative blocks.

Drawstruct
Xenon

Draw or generate random structures

Explosion proof obsidian
Miner34

Adds an explosion proof obsidian.

Better Roads
DragonWrangler

allows players to make roads with less jagged edges