UI Addons
 

Does anybody know if any UI addons are supported by EQ? More specifically I'm looking for a cooldown timer for my skills.

Check out the downloads section of EQInterface.com and sort them by Date to look for some UI mods you might like that will be compatible with your Titanium client.

But for the timers you are asking about, it's much easier to use GamTextTriggers. It monitors your log file and executes audio triggers and text overlays, and can also do visual timers.

It's more efficient than using in-game audio triggers and many people report having better in-game performance after setting it up (read the instructions on the GTT page).