This is in continuous development. Here is the link. If you require assistance on how to download from a Subversion look on the ArcEmu wiki. I have since the release of this given out "zips" so you can save yourself the trouble of downloading via SVN.
You can find those here:
https://subversion.assembla.com/svn/arcaddon/zips(not-always-uptodate)
SVN:
http://subversion.assembla.com/svn/arcaddon/
Trac:
http://trac.assembla.com/arcaddon
If you feel like keeping track of this continuous development or you wish for updates when the SVN is changed, come on freenode and join the ##arcemu channel. Alternatively you can use CIA.vc, Ohloh, or Assembla(preferred) to keep track of development and get emails on updates etc.
The current addons:
Any bug reports or suggestions should be posted in the ArcEmu forums at http://arcemu.org/forums/index.php?showforum=137ArcGM - Renamed, restored, rebuilt, optimized, bugfixed and revamped ticket system. (Used to be GMH/Ticket Tracker)
Screenshot: http://img80.imageshack.us/img80/2881/15100526.jpg (Its a little outdated new UI is going to look awesome when I am done with it)
Arcemu_FeedbackUI - IMPLEMENTED! Ever been on the PTR, Alphas, or Betas? This UI will allow players to document bugs, provide feedback, and more! Best of all its already implemented into ArcEmu's core - so all you have to do is dump the data from the table its collected to or read it with dfighter's php website (included in /trunk/src/scripts/ )
Screenshot: http://i49.tinypic.com/1fwbix.jpg
"Optimizations" This addon is a tweak to the Lua engine that prevents it from culling garbage during loading screens (Which speeds up the loading screens by about 20-70% depending on how many addons you are running)
Thank you
~Marforius