Wilhelmines Natural Biomes
Liil

Adds 9 new biomes

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.

Ocular Networks
mt-mods

Draw power from the world, and use it to power machines and tools.