Bukkit

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

WorldGuard

A working voice chat in Minecraft!

Set up custom villager shopkeepers

Make Things go Boom

The Bukkit World Management Plugin.

A free and reliable backpack plugin with lots of customisation options.

Dynamic web-based maps of your Bukkit/Spigot server

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

The modern Essentials suite for Spigot and Paper.

This is a easy to use GUI shop plugin.

Modern Minecraft death chest plugin for Bukkit, Spigot, and Paper servers.

NPCs for Bukkit

The most used authentication plugin for Spigot and CraftBukkit!

Player and Mob Heads Full-featured plugin

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

4700+ unique structures available to /paste into your server

Marriage Master

Stops people from breaking farmland

Fully customize any mobs (and create custom mobs) with a powerful scripting skill system, attributes, equipment, special AI, and much more, along with custom spawners and spawning rules. The ultimate plugin for making RPG servers and minigames.