Bukkit

CraftBook adds a number of original gameplay elements to Minecraft from integrated circuits to gates

Disguise as any mob in minecraft!

An extensive questing system

Destroy others beds with bedwars reloaded

Custom rank tree, quests, bounties, and 20+ unique perks to offer your players!

Help chopping tree easier

Adds new Enchantments to your Server.

Appear to hack to other players

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

Stables provide steed protection, and other horse related things.

PrisonUtils

Brew alcoholic potions, get drunk and have fun!

Well-praised PvP minigame your server NEEDS!

This plugin allows users in kitpvp servers to create teams.

Offers full rpg system, classes, weapons, spells, mobs and quests

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

Its a plugin, but its mod-like: New mechanics, new worlds, custom bows and strucutres, faster game, survival reinvented.

Create and control moving ships out of blocks!

A fully customizable and open-source DayZ/MineZ post-apocalyptic Minecraft plugin.

Build cannons out of blocks and load/aim/fire.