Nyancat's heaven (reworked)
Hybrid Dog

Adds a nyanland in the sky

Archaeology
SkyBuilder1717

Adds an looting and API in archaeologing

Randomized Map-specific Ores
Piezo_

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

Underground Survival Lighting
Arkatron

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

Unstable Caves
M BLOC

Some stones may cave in if punched, making underground expeditions more risky.

World Borders
argyle

Add impenetrable barriers to the sides and bottom of the world.

golden lava
GigaByte

add golden lava

Tac Nayn
GreenXenith

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

More Coral
Nathan.S

Adds coral in more colors.

Sticks Stones
MikeRedwood

Makes Sticks from leaves and scatters small stones

Beautiful Boulders
regulus

Procedurally Generated Rocks with (pretty) Accurate Collision Boxes

morebiomes
mzs.112000

A simple mod adding a few biomes to Minetest Game

Fly-B-Gone!
Hugues Ross

Hides butterflies/fireflies

Spawn redo
cathaya7d4

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

Purple ore
X-DE

Adds new purple ore to floating islands and caves from height 200 to 31000.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

treasures
ademant

Treasure nodes with useful items

Mud
Blocky Player

Adds stylish mud blocks and even blocks you can walk through. Setup traps, secret rooms and much more!

Silver
Jackknife

adds silver ore and tools