WowAce

Checks your gear before bosses and yells at you if you're an idiot

Dynamic mount macro generator

Visualises healing.

A replacement tradeskill window for Classic

Displays Instance Maps

Displays online friends.

Dropdown library for Ace3 options, extensible to other options formats. Works ok.

Questing minion

Manages social information with a focus on main-alt associations.

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

Tooltip of awesomeness. Moo. It'll graze your pasture.

In-game EPGP guild helper, supports standby, main/alt shared pools, minEP, offpecGP. Fixed price list with progress multiplier.

Tracks the HoTs you cast.

OneCore is the centralized code shared between the OneBag Suite

A UI for searching the guild roster.

Compact & customizable filtering, monitoring and grouping of buffs and debuffs

Utility library with shared functions and data for various addons by NeoTron.

Prat

A library to help with localization of item types and subtypes.

Shows where the equipment of inspected users or yourself is from.