Sun Flowers
Hybrid Dog

This mod generates flowers which close their heads at night.

Trucraft
mt-mods

An alternative crafting system done entirely in the world.

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

Fragments
Amaz

A mapgen with a goal, with things needed to advance to the next level.

Sticks Stones
MikeRedwood

Makes Sticks from leaves and scatters small stones

treasures
ademant

Treasure nodes with useful items

Kitty/Kitto Ores
nemokitty9

Nemokitty9's own ore pack. Includes Tools!

Spawn redo
cathaya7d4

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

Fly-B-Gone!
Hugues Ross

Hides butterflies/fireflies

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.