World Quests are a type of daily quests with a limited duration, which was made available in Legion WOTLK Gold. It's a great system that suffers from World of warcraft's outdated map interface, however World Quest Tracker fixes those issues. In a zoomed display, World Quest Tracker shows players the rewards offered by World Quests in every zone It allows you to swiftly discover if there's a reward relevant to your goals. 

You can simply click the reward icon to follow multiple quests from around the world in your quest windows so that you don't have to check the map again and again. World Quest Tracker also has an stats screen that shows the number of world quests that you complete, cumulative rewards, and more.

Threat Plates

There are a lot of addons to choose from that change the appearance of the standard Blizzard nameplates and make them much easier to see when fighting. Though they're called "threatplates," they can be used by every class or spec, and isn't limited to tanks. 

Like many other add-ons, the nameplates will change colourdepending on your threat's nature, but there's lots of customisation options if you wish to experiment in the possibilities.

Of course, the majority of the decision you make when selecting a nameplate extension will boil down to your own personal preferences. One of the things I love about Threatplates are the small quest icon that is visible above the enemy's nameplate when they have to finish an actual quest. I'm sure there are addons that do the same but Threatplates is what I need and I see little reason to cheap WOTLK Gold change it now.