Emerald Bank (MineClone)
Nathaniel Freeman

Keep your Emeralds in a Bank

Wisps
ElCeejo

Adds non-entity mobs called Wisps

pathv7 redo! (Mapgen V7 only)
Emojiminetest

Creates a worldwide network of paths, bridges and tunnels.

Smoke Signals
Just_Visiting

Signal your friends, or warn your enemies!

Multiple Biome Generator
chaosomnium

230 Pseudorandomly Generated Biomes, Trees, Fruits, Ores, Tools, and Liquids

Ocular Networks
PolySaken

Draw power from the world, and use it to power machines and tools.