treasures
ademant

Treasure nodes with useful items

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

World Borders
argyle

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

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.

Underground Survival Lighting
Arkatron

If you like underground light in survival, use this mod, it can help that.

Tac Nayn
GreenXenith

Adds Nyan Cat's evil twin, Tac Nayn (and a gray-scale rainbow).

Sun Flowers
Hybrid Dog

This mod generates flowers which close their heads at night.

Sticks Stones
MikeRedwood

Makes Sticks from leaves and scatters small stones

Spawn redo
cathaya7d4

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

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.