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.

Ethereal NG
TenPlus1

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

KSurvive 2
MadKamel

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

Loria (alpha)
siegment

Survival in hardcore acid-alien sci-fi themed world

Base Modpack
karlexceed

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

Caverealms Lite
Shara

A mod for Minetest to add underground realms.