Kawatt

Origin addon that adds the Hivenest, a living nest with a symbiotic relationship with bees.

Mobs spawn only at night

Makes rail crafting recipes cheaper by using nuggets instead of ingots

Adds a suspicious snow block

Spawns you underground

Makes torch recipes give 2 times more torches

Spawns you with everything you need for a cave only playthrough

An Origins Datapack that adds the Crystal Weaver, an arachnid that can make warp webs.

Origin datapack that adds the Rockeater, a small creature that can only eat stone

Adds cotton candy

Transforms the overworld into a cave only world

Makes lantern crafting recipes cheaper by halving the amount of iron needed

Origin datapack that adds the Spore Lizard, a small critter that glows, and crawls, and climbs

Origin datapack that adds the Enderxolotl, a mix between Merling and Enderian