treasures
ademant

Treasure nodes with useful items

Fly-B-Gone!
Hugues Ross

Hides butterflies/fireflies

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Spawn redo
cathaya7d4

Drop-in replacement for default/spawn for more third-party biomes

golden lava
GigaByte

add golden lava

Floof
Momo

Add BicBiomeCraft inspired biomes, tools, and items.

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

An API for automatically registering recipes, nodes and ore generation.

Mud
Blocky Player

Adds stylish mud blocks and even blocks you can walk through. Setup traps, secret rooms and much more!

Silver
Jackknife

adds silver ore and tools

Too many ores
TeufloV

This adds 53 new ores. But most of them are useless.