NOTE: This addon is old and no longer being updated.
Justify is a chat addon designed for people who use multiple chat frames, and want the chat frames text justification to be something other than right-aligned.
To change the settings, you must edit the LUA file in side the Justify folder. If you open that file (Justify.lua) up, it will have instructions on how to change which frame is aligned where. I hope this mod works for you.
On the current to-do list is to make the addon more usable inside the game, aka adding chat commands, etc.