Quoth the Raven
We're going to start with my current favorite tracker, outside Weak Auras, and that's Raven. You can see it in action in the video in the header image, on my mage, and I'm showing off both the buff tracker and the debuff tracker. The debuff tracker is the section that stacks up to the right hand side, while the buff trackers sit over to the left of the mage. As you can likely see, there are several different buff tracking elements visible.
You can see the three different trackers labelled 1, 2 and 3 to the right. Gaze in awe at my MS Paint skills.
Section 1 is what Raven calls the In-Combat tracker, which pops up when you have specific buffs on yourself, allowing you to cancel them with a right-click. This, frankly, is rather a niche item, although it could definitely be useful in certain settings, such as if you are being BoP'd by a paladin to remove a debuff, and need to hit a /cancelaura macro to get rid of it. I don't doubt there are other situations when you'd want to be rid of a buff in a hurry, but none spring to mind.
Next up, moving over to number 2, this is the default buff pane. Now, you'll have to forgive its slightly overlapping look, here, it's a result of how it interacts with the ElvUI Skins addon, which, for some reason, makes it pad weirdly. Thanks to Raven's customization, it's very easily fixed, just increase the padding on the buffs until they're in an acceptable layout. As you can see, buffs which have a duration, in this case, Velocity, Pyroblast and Windsong (from left to right) have a timer beneath them to indicate how long they have remaining. I like the compactness of this display, but I do think that if you are not completely familiar with the look of your abilities' icons, you might struggle with this layout.
Moving on to no. 3, we're now looking at what I consider to be the most useful way Raven offers to display your buffs. This is a buff bar group, and as you can see it gives you an icon, as well as the name of the buff, and its duration. With all of these, it is possible to blacklist buffs, so I could remove Molten Armor from all the lists, if I was confident enough that I'd remember to apply it every time. All these groups are using the Raven default settings, so it's a really simple setup. Let me run you through it.
Removing other people's buffs for your benefit
If you're a mage, priest, shaman, warlock, or any class with an offensive dispel at your disposal, you will want to use it whenever you can. Not just to remove your opponents' buffs, but in some cases to steal them for yourself and have your wicked way with them. But sometimes it's hard to tell just exactly what can be stolen and what can't, or indeed whether mobs have something worth taking at all. PvPers will want to ensure that their targets are as unbuffed as possible, and PvEers could often do well to purge destructive debuffs on their targets. If only there was an addon to help with this arduous task! Well, there is.
Naturally, you can just look for the buffs with the golden border in the standard unit frames, they're usually the ones that can be removed, but it's not always the easiest thing in the world to do, and that's what addons are for, to make things easier. And an addon that does a great job of this is Steal, Purge & Dispel.
This brings up a box for your target, and another for your focus, easily configured in both instances, showing what buffs they have that you could remove with your buff-stealing or buff-removing ability. The addon is smart enough to know whether you are playing a class that has an offensive dispel at its disposal, and will hide itself if there isn't one for you to use.
Addons are what we do on Addon Spotlight. If you're new to mods, Addons 101 will walk you through the basics; see what other players are doing at Reader UI of the Week. If there's a mod you think Addon Spotlight should take a look at, email firstname.lastname@example.org.