WoW addons for patch 3.3.5a

Download / Install

select the addon zip file you want
click the download button
unzip in your-wow-3.3.5a/Interface/AddOns/
(re)start the game
before entering the world click the addons button at the left bottom of the screen, enable the load outdated option if necessary

Bagnon
inventory management, a single searchable bag with all your bagslots
Bartender4
customizable action bars
CCReport
prints chat messages about CC and losing buffs
DeadlyBossMods
boss timers for raids and dungoens
GearScore
shows the score of gear, used to measure player skill..?
Grid
party and raid frames in a nice grid
Omen
customizable threat meter
OmniCC
better cooldown timers on action bars
PitBull4
customizable unit frames
Quartz
customizable cast bar
Recount
customizable damage/healing meter
TellMeWhen
customizable icons for cooldowns, (de)buffs and other stuff that may need an icon
Titan Panel
adds a bar on top or bottom of the screen with customizable information
TidyPlates
replaces floating health bars, shows proper aggro for tanks
TinyTip
replaces tooltips
WeakAuras
customizable timers, icons and bars for cooldowns and buffs