Bukkit

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

WorldGuard

The Bukkit World Management Plugin.

Dynamic web-based maps of your Bukkit/Spigot server

Create modern looking holograms.

The modern Essentials suite for Spigot and Paper.

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

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

Grief Prevention

Open anyone's inventory as a chest in real time!

Toggle PvP for your players, stop combat log, protect newbies, stop border hopping and more!

Multiverse Inventories allows you to control who and what can cross world borders!

LoginSecurity

Remove lag and improve the performance of your server significantly with this tool!

Expand the capabilities of Skript with skRayFall

CoreProtect

Mine spawners with silk touch

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

Remove lag on your Bukkit server with this easy to use plugin

ServerSigns - Bind player and server commands to signs