Purple ore
X-DE

Adds new purple ore to floating islands and caves from height 200 to 31000.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

treasures
ademant

Treasure nodes with useful items

Obdy
Sires

Adds some pretty OP tools :)

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.