MineClone 5
kay27

A fork of MineClone 2 with no release milestones, rapid delivery, merges by one approval and no MC target version limitations. But technically it's still MineClone 2.

Plantlife
VanessaE

Adds various kinds of plants, fruit bushes, fallen trees, and a whole host of foliage and other ground cover.

Ethereal NG
TenPlus1

Ethereal mod uses the v7 mapgen to add many new biomes to the world.

Loria (alpha)
siegment

Survival in hardcore acid-alien sci-fi themed world

KSurvive 2
MadKamel

A game built 100% from scratch, including code, textures and sounds.

XaEnvironment
AiTechEye

A game that aims to contain lots of environments and things.

More Trees!
VanessaE

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

Caverealms Lite
Shara

A mod for Minetest to add underground realms.

Algae
Just_Visiting

Algae mapgen addition to "Minetest Game"

Base Modpack
karlexceed

This combines several other mods that I consider a basic minimum starting point for worlds.

NodeCore Nature: Revised
Warr1024

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

Valleys Mapgen
Gaël de Sailly

A map generator with valleys, rivers, mountains and many plants.

Glowshrooms
rudzik8

Adds glowshrooms

Euthamia
Avicennia_g

Grassy Goldenrod plant for Nodecore