Wilhelmines Marinara
Liil

adds water structures and coral reefs to the oceans of your world

Islands
Termos

lua mapgen featuring tropical islands and vast ocean

More Trees!
mt-mods

Adds a whole bunch of new types of trees, some bearing fruit or similar, using biome_lib for the placement engine.

Wilhelmines Natural Biomes
Liil

Adds 9 new biomes

Dense Ores
benedict424

Adds rare ores with twice the drops of their normal counterpart.

Other Worlds
TenPlus1

Adds asteroid layers and height-based skybox switches to create space environments.

NodeCore Cats
Warr1024

Add adorable cats to NodeCore

Dream World
Furious_mat

add Dream World in mineclone

Grave
ElCeejo

Adds an eerie biome with multiple mobs.

Swamps
Hybrid Dog

Adds swamps

Large Slugs
jwmhjwmh

Adds node-based slug mobs to your world

Geodes
AwesomeDragon97

Adds amethyst geodes and an API for making custom geodes.

Alien Material
debiankaios

Adds new blocks, items, and tools from aliens. A new time begins.

Pedology
Wuzzy

Adds some different ground blocks in several wetness levels; the wetness slowly flows downward.

Australia
demon_boy

Adds a wide variety of Australia-themed biomes and content

NextGen Bedrock
StarNinjas

Adds an indestructible bedrock layer at the bottom of the world.

Subterrane
FaceDeer

A mod that creates vast underground caverns and allows biomes to be defined for them

Multiple Biome Generator
chaosomnium

230 Pseudorandomly Generated Biomes, Trees, Fruits, Ores, Tools, and Liquids

Nodeternal Darkness
Kimapr

make nodecore very dark

Superflat
srifqi

(Yet Another) Superflat Map Generator: Customize world generation layer by layer

Asuna
EmptyStar

A vibrant world of natural wonders

Nodecore Rabbits
LandarVargan

Adds rabbit holes, rabbits, and traps to the Nodecore game

Skygrid
ROllerozxa

Custom skygrid mapgen.

Wilhelmines Living Floatlands
Liil

Adds various prehistoric animals to your Floatland Zone, if you are using V7 Map Generator.

Biome Lib
mt-mods

The biome spawning and management library.

Watershed
paramat

A river / mountain range mapgen

Meze
Calinou

A special ore that kills you when mined.

The Lower Road
Deadlock

Adds a long road from -Z to +Z to the world, during world-generation.

Smaller Steps
Hamlet

Makes stairs and slabs use smaller shapes.

Universal geometry realm
paramat

Create worlds of varying shapes

voxelmanip experiments and remade math mandelbox mapgen
chaosomnium

Voxelmanip mapgen with strange layered zone experimental mapgens.

Stonebrick Dungeons
Hamlet

Turns newly generated cobblestone dungeons into stonebrick.

Caverealms
HeroOfTheWinds

A mod for Minetest to add underground realms.

Fireflies
Shara

Adds fireflies which can be caught in a net and placed in bottles for lighting.

pilzmod
Phii

a spreading mushroom biome which you can spawn into the world, with its own monsters and a boss you need to slay to stop the biome's growth. Best played with bow & armor mod and after reading manual.

Zero-Effort Custom Minerals
Piezo_

A tool for registering entire materials, complete with ore generation, tool-sets and automatically generated sprites with almost no effort required

Nssb
TenPlus1

BIOME integration for nssm, the not so simple buildings.

Native Villages
Liil

Adds villages of native people to the world.

Citygen
BuckarooBanzai

city mapgenerator

The Road (NC)
Winter94

This is a port of thelowerroad for NodeCore that adds a long road from -Z to +Z to the world, during world-generation.