Bukkit

A simple plugin to reward players based on their mcMMO level.

Makes it easy to make auto backups of your server into a zipped file.

API for on-server statistics.

This mod allows players to look up the crafting or smelting recipe of an item or a block.

If you are sick of people asking for op, or just want to troll people, then this plugin is for you!

PermaPotions - Give permanent potion effects to players via permissions

A minecraft style login bonus

Cranked

Jail & Mute unrespectful player!

ServerSpy - see commands and console output!

AngelStarterChest allows you to set a chest and put items in it that new players will get upon join.

Double jump!

AdminPlusPlus

BungeeCompass

Displays real-time tweets in Minecraft chat.

A lightweight whitelist system for use with PermissionsEx, no configs, only permissions

Display of players, tps and memory in the web

DataManagerAPI

OnJoinMessage+ is a plugin that display a message that the player can see when he joined the server.

LagFinder