Bukkit

Slimefun

The banning plugin that does everything. Properly.

LoginSecurity

Dynamic web-based maps of your Bukkit/Spigot server

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

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

PowerRanks

BukkitGUI - the most downloaded GUI for bukkit and any other server

Custom Join Items

Schedule configurable server wide broadcasts easily

KitAdder

Massive Core

Lockette v1.4 - Simple chest and door lock, no databases!

MyCommand

Enchant your items!

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

An addon to the popular addon Skript that exposes the Bukkit API to general server owners

Expand the capabilities of Skript with skRayFall

Change the colour of the server chat!

Create user friendly menus to travel to worlds