Bukkit

Backpacks, mobile furnaces, etc... as items! No client-side mods required.

Its a plugin, but its mod-like: New mechanics, new worlds, custom bows and strucutres, faster game, survival reinvented.

PreciousStones

Command Signs

Teleport using buttons with price/reward/custom messages

A simple plugin to handle permissions, groups, prefixes and suffixes with GUI and Web Interface

[UNMAINTAINED] Intuitive and powerful plugin to create graphical user interfaces.

aims to improve the bow vs. bow combat experience while staying true to Minecraft's vanilla mechanics as much as possible

Easily configure what plants can grow and how quickly then can grow.

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

McMMO Rank UP

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

Zombie versus Player Game

Complete RPG Mod, featuring Races, Classes and skills.

Order allowing you to leather your items

A customizable & secure shulker viewer plugin

Adds new Enchantments to your Server.

Catacombs

Troll at the NEXT LEVEL

A simple plugin to protect villagers and related mobs