treasures
ademant

Treasure nodes with useful items

World Borders
argyle

Add impenetrable barriers to the sides and bottom of the world.

Obdy
Sires

Adds some pretty OP tools :)

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.