Bukkit

Use emeralds to craft tools and armor with random enchantments

Create displays that wont go away!

More Potions

Who wants long wires? Go wireless!

Allows blocks a chance to respawn increasing resources per chunk.

Random Spawn

High Speed Rails to make minecarts worth building

Fear death as MonetaryDeathPenalty will remove currency from a player's account when they die.

New items, blocks, machines, energy system and more!

EntitySuppressor

Automatic inventory management for all your players! Defeat the tedium of manual organization! AutomaticInventory

Teleport players to spawn/hub/lobby upon join!

Get mobs abilities by collection their DNA and combining it with yours!

Per user, per world highly configurable compass mechanics.

The ability to lock blocks with keys. Uncheatable! No way to bypass these locks unless you have the key!

Add a new dimension in your server by adding an item that will prevent your items from dropping on death

Control how long day and night last.

Wizards

Put the name "Silence Me" on a Nametag to silence your mobs.

Stack mobs in a highly efficient way to decrease server and FPS lag.