Bukkit

Display any image in-game on a map! (or many)

a feature-rich world size limiting plugin, which can also generate or trim a world to your border

Change your ingame skin

QuickMarket

Replicate first-person shooters with advanced gun-mechanics and a vast number of exciting and fully customisable features.

Draw images on maps and put them in Itemframes

Lop off Player and all Mob Heads with configurable drop rates + pvp-farming nerf, includes detailed commands and permissions

Make Things go Boom

Simple Sit

The premier long-range map editing tool for Minecraft SMP.

**Unmaintained** Display an RPG-style health bar above mobs and players.

Create user friendly menus to travel to worlds

Protect and lock Chests, Furnaces, etc. with a easy to use GUI.

Adds 70+ new enchantments to the game

If you've ever used the VeinMiner mod for minecraft Forge, it has now been recreated for Bukkit, CraftBukkit, and Spigot

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

When entering the void your will be teleported back to spawn.

Votifier

Brew alcoholic potions, get drunk and have fun!

HideStream - updated! - Simple, lightweight, effective.