Bukkit

TNTRun minigame

NoLagg

/register, /login

Powerful, craftable Wand items and Spell scripting

Makes combat work like before 1.9, with no weapon cooldown etc.

Claim land of any shape, not just within a chunk

PreciousStones

Command and config free elevators / lift

Simple plugin to let you know the damage you just caused to a mob, and how much health it has left.

Have your players pay to switch their ranks!

Per world inventories and health

Custom backpack items in vanilla Minecraft!

Prevention of hacks and other malicious tinkering on a Minecraft server.

A minimap without clientmod using Maps!

A plugin that keeps multiple worlds in either day or night!

A global trading system

Bukkit Economy

Use flint to edit armor stand attributes without commands

A home teleport point plugin for Bukkit

A simple antigriefing tool.