WowAce

Friends & Guild Data Broker plugin.

Modifies the inbox into a scrollable inbox, including open all options

Sphere

Reminds you if your flask/elixir and/or Augmentation Rune and/orfood buff is about to expire or has expired

Makes the Blizzard options frame movable and resizable

Rep2 displays a message, which shows how much reputation you gained, and how much is needed until the next standing.

Niagara

FuBar_WhisperFu

Adds your name to chat messages

Fires events whenever a raid member "fails".

Does stuff for sachmo

Displays events from Calendar for upcoming week in tooltip.

Adds party/raid role icons in useful places

Auto roll greed, need, pass or manually roll on items.

Automatically leaves the global channels when inside an instance/raid and restores them when exited.

Give logical progression of Mining, Herbalism & Skinning. Will not be updated with WoD zones

Simple right click casting.

mHud

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

Show extra information about Jewels and Enchants in tooltips.