Bukkit

Mine spawners with silk touch

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

Grief Prevention

An intuitive and powerful plugin to create graphical user interfaces.

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

The best chest&sign shop system for Bukkit

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

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

Keep your inventory in a chest when you die !

If you've ever used the VeinMiner mod for minecraft Forge, it has now been recreated for Bukkit, CraftBukkit, and Spigot

Stop Combat Log, Toggle PvP, No Kill Abuse, Newbie protection, Stop region border hopping

Creates images and pixel-art using in-game blocks

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.

**Not Maintained** Display an RPG-style health bar above mobs and players.

Lop off Player and all Mob Heads with configurable drop rates + pvp-farming nerf, includes detailed commands and permissions

Unique and challenging custom achievements or quest-like objectives on your server! Books, fancy GUI, rankings, rewards, effects and more!

a feature-rich world size limiting plugin, which can also generate or trim a world to your border

Disguise as a mob or other player

ChairsReloaded

Replicate first-person shooters with advanced gun-mechanics and a vast number of exciting and fully customisable features.