WowAce

Keep you bags clean with easy loot filtering and removal.

Tracks and reports party rolls

Disables the "Release Spirit" Button for a short time when you have a soulstone

FuBar2

Guild members

ClearFont2_FontPack

Show a bar indicating the unit's Holy Power count.

Adds Auctioneer "bought for" filters to Baggins ("disenchant", "vendor", etc)

Tracks your crits.

PhatLoot

Shared handling of media data (fonts, sounds, textures, ...) between addons.

LibRockModuleCore-1.0

Simple item compare tooltips

Adds PvP status to Grid frames.

CharacterInfo

How much of your life have you spent ingame?

Library to handle and store information about frame that are possible targets to anchor other frames to.

Show a bar indicating the unit's Soul Shard count.

Displays the internal cooldown of Eclipse as a ClassTimer bar

Simple loot specialisation display with selection in tooltip.