Bukkit

Reduce lagg from you server without players knowing.

A plugin that allows the invisibility of other players to reduce lag.

Disables redstone changes at night to reduce lag.

Limit Pointless Mob Spawns + Reduce Lag!

Stack mobs in a highly efficient way to decrease server and FPS lag.

MyBlock automagically protects user blocks from grief (placing, breaking, interacting) with minimal lag and a full feature set.

NeverLag manages your server lag with just one command, or a timer.

Anti Drop does not allow anyone to drop items.

Plugin that disables users from using buket's and spamming/throwing eggs

Remove the bubbles from experience potions for a more satisfying feeling!

Cancel domage or death, due to a lag or regen, when a player log on or is teleported.

Clears items, that drop on player death! Reduces Lagg!

NoMoLag removes entities, which clears lag, and reduces RAM usage.

Removes laggy annoying Exp Orbs from your game!

Get rid of those laggy orbs!

MercilessNoRain is an extremly lightweight plugin that removes rain which can cause lag.

Do /sendme for a lag test

Modifies peoples max health based on their ping (more lag = less health)

Adds the /pingtest command useful for testing server lag.

Limit the amount of mobs by type within a certain radius to prevent server lag

Suppresses TNT scattering and has a chance to reduce lag

Reduce or remove all server lag, Use 2x less ram as before!

The ultimate PvP plugin, no lag and easy to use!

This is functional but dosent do anything other than remove some lag

This will reduce the basic lag of any server!