Bukkit

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

PermissionsEx

WorldGuard

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.

The Bukkit World Management Plugin.

A plugin to create holograms in Minecraft.

NPCs for Bukkit

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

The most used authentication plugin for Spigot and CraftBukkit!

Set up custom villager shopkeepers

Chest Commands GUI

Mine spawners with silk touch

Colored Tags

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

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

EssentialsX

The best chest&sign shop system for Bukkit

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

SetSpawn