Bukkit

Display your player's levels

Minecraft Head Plugin

Give your players special abilities!

Pacifism - Keep items/xp on death!

Create ranks, and enjoy watching your players climb up them. In style of course.

A simple but feature rich chat and name editor.

Team PVP with magic and a touch of RPing.

Simple Actions

Clans is a plugin that allow creating Factions

SweKits

write text on paper, no chat commands or client mods needed!

a fully customizable complex rpg plugin

Break all types of glass with arrows!

Skyrim-style resource gathering for the masses!

A Bukkit plugin that adds Hallucinations to minecraft!

Allows worlds to be "space worlds" in which being without your space suit can prove deadly.

Plant wheat farms up to nine times faster.

Add custom auras to your minecraft experience!

A new way to get ice!

Allows admins to hit users with a stick and scan them for any illegal items which can then be confiscated.