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.

Caverealms Lite
Shara

A mod for Minetest to add underground realms.