Bukkit

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

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

WorldGuard

PermissionsEx

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

A plugin to create holograms in Minecraft.

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

The Bukkit World Management Plugin.

NPCs for Bukkit

The most used authentication plugin for Spigot and CraftBukkit!

Plugin Manager For Bukkit

Set up custom villager shopkeepers

Mine spawners with silk touch

CS-CoreLib

EssentialsX

Chest Commands GUI

Colored Tags

Easily add commands to NPC's! [1.8-1.12] (BungeeCord Support | Citizens 2)

The best chest&sign shop system for Bukkit

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