Fragments
Amaz

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

Obdy
Sires

Adds some pretty OP tools :)

golden lava
Giga_M

add golden lava

Fly-B-Gone!
Hugues Ross

Hides butterflies/fireflies

treasures
ademant

Treasure nodes with useful items

Sticks Stones
MikeRedwood

Makes Sticks from leaves and scatters small stones

Noriel Sylvire's Minerals Core Modpack
Noriel_Sylvire

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

Floof
Momo

Add BicBiomeCraft inspired biomes, tools, and items.

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.