pathv7 redo! (Mapgen V7 only)
Emojiminetest

Creates a worldwide network of paths, bridges and tunnels.

Multiple Biome Generator
chaosomnium

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

Emerald Bank (MineClone2)
Nathaniel Freeman

Keep your Emeralds in a Bank

Smoke Signals
Just_Visiting

Signal your friends, or warn your enemies!

Wisps
ElCeejo

Adds non-entity mobs called Wisps

Ocular Networks
PolySaken

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