Bukkit

NBTEditor allows easy customization of entities and spawners. It also provides tools to manage other NBT related objects.

Commandless, Multi World, Player Owned Shops (Vault)

ServerSigns - Bind player and server commands to signs [1337]

Inexpensively protects your ores from cheaters.

A better way to trade! For Citizens(2).

Quickly add invisible light sources

Easy Warp is an easy and fast to setup way to warp throughout your server.

**ABANDONED**

Makes combat work like before 1.9, with no weapon cooldown etc.

bPermissions

Teleportation, warps, signs, GUI, homes, fully customizable, teleport requests!

KitAdder

iConomy - Reloaded!

Lightweight Essentials! usefull commands and features for Minecraft! [Lightweight Essentials]

Delay | Block /spawn on PvP | Lobby Friendly | Customizable Messages | And Much More

A powerful and secure anti-grief tool for storage blocks, like private chests.

Provides automated plots with protection (MultiWorld support)

Lightweight Protection for Chests, Furnaces, Dispensers, and more

Player and Mob Heads Full-featured plugin

SlimeScrap