You can get a pretty good overview at my wowace profile.

SilverDragon
Tracks the location of rare spawns
DropTheCheapestThing
Funnily enough, lets you drop the cheapest thing you have
LootSink
Funnels your loot notices into floating combat text
ServerRestartSound
Plays a sound to warn you when the server is about to restart
QuestPointer
Sticks quest POI icons onto your minimap, and points arrows towards them
OpenAll
Opens all your mail
BetterQuest
A questing addon
FuBar_QuestsFu
A questing addon for FuBar
BankStack
Moves items around for you. Sorts your bags.
BuffDrop
Really simple but hard to miss warning when a buff drops
Broker_Skills
Broker display for your tradeskills
Broker_Speed
Broker display for your current speed
Want to know how much of a recipe you could make if you visited the bank? If you went to the vendor and bought mats? Now you shall know!
Broker2Fubar
Shows your LibDataBroker sources in FuBar.

Also contributed to...

Mendeleev
Rewrote the sets menu, added most of the 1-59 dungeon reward sets, jewelcrafting, and lockpicking data
BulkMail2
Wrote the GUI
PeriodicTable (lib)
Added lockbox skill requirements
PitBull
Wrote the Portait module
ag_UnitFrames
Wrote portrait system (notice a theme?)
Quartz
Rewrote the flight timer module, and added support for ToFu
ColaLight
Rewrote entire display and tooltip hooking functionality

Ancilliary utilities

wowace.py
A Python-based addon updater for addons hosted on wowace.com. (No longer works, since wowace changed vastly.)
"Top list" data miner
Blizzard publishes daily rankings of various bits of data -- most killed mobs, deadliest mobs, most completed quests, and so forth. I wrote a parser to grab and save this stuff, intending to write an app to make it more searchable. I never got around to that... but it does work.