I won't swear this is all correct but from what I can tell, he's running nurfed combat log, damagemeter, titanbar (the thing at the top of the SS), ctmod (at least some parts of it) and ctraidassist. I'm not sure what barmod he's using, it's not ctmod's and it doesn't look like flexbar, which are the two I've used.
If you're interested in making your WoW interface much more personalized, interesting and useful, I'd recommend navigating your way over to
http://www.curse-gaming.com/mod.php. Curse is pretty much the universally recognized repository of all things mod-related. If there's something they don't have, I don't know about it. As a warning, not every mod is up to date or still being updated by the author so make sure you check the versions, the release date and the notes to know what something does and when it was designed. Many out of date mods work fine, but better safe than sorry.