Bukkit

The ultimate Bukkit-XenForo synchronisation plugin

FishChecker

Mineload

Don't allow bad players to do bad things on your server!

KUrlLogin

SELBans - Better banning Managment

A plugin to manage manual point definitions for Minecraft Overviewer from within the Minecraft client.

Allows you to block any advertisement on your server!

Allows commands to be executed as console.

Backs up world backups to Google Drive

TwitBukkit

Time based, mySQL compatible banning plugin with simple use

MySQL-Register Reloaded

Connect your Minecraft server to your NodeBB forum.

Achievements plugin for the modern bukkit

Display a web based player list of who is currently on the server.

bPermissionsWebGUI

If your users refer somebody successful, they get rewards (everything configurable)

Ticket System GM Bukkit Plugin by Skyost

WooMinecraft is a Bukkit/Spigot plugin that lets you setup a Minecraft donation store on your WordPress site.