Bukkit

WorldEdit is an in-game map editor for both creative and survival

WorldGuard

PermissionsEx

Vault is a Economy/Permission plugin for hooking into the various Economy and Permission plugins.

A collection of useful commands and features for server admins and players.

A new perfect way to clear common lagg in your server!

A plugin to create holograms in Minecraft.

The Bukkit World Management Plugin.

NPCs for Bukkit

Plugin Manager For Bukkit

The most used authentication plugin for Spigot and CraftBukkit!

CS-CoreLib

Mine spawners with silk touch

EssentialsX

Set up custom villager shopkeepers

Chest Commands GUI

Allows server admins to easily modify how Minecraft works without programming anything

Slimefun

Colored Tags

The best chest&sign shop system for Bukkit