Basalt + Fertilizer
Daniel

Adds basalt to the underground which can be made into fertilizer. Useful for farming flowers if you need dye for colored nodes.

Wilhelmines Living Desert
Liil

Adds plants to the default deserts of minetest game.

Wilhelmines Natural Biomes
Liil

Adds 9 new biomes

Loria (alpha)
siegment

Survival in hardcore acid-alien sci-fi themed world

NodeCore Nature: Revised
Warr1024

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