Hi Praetora,
It’s not an addon, but you can do this on Wowhead.
- Make an account on Wowhead if you don’t have one yet.
- Download the Wowhead Client ( http://www.wowhead.com/client ) and install it. If you have questions about the program, there’s a FAQ and other information on that page too.
- Log into your character (make sure you restart WoW if it was already open) with the addon “Wowhead Looter” loaded. It should pick up your character’s quest history automatically, but you might want to type “/wl quests” just to make sure.
- Log out, and run the Wowhead Client program. It will upload your character profile and the data your client has cached about items, quests, spells, mobs, and other things to the Wowhead website. This is how Wowhead gets information about everything.
- Go back to the Wowhead website, hover over your username at the top left, and click on the “Characters” entry in the pop-up menu. Click the check mark next to your character, and click the “Pin” button to make it your default character. (This is helpful later if you have more than one character.)
- Now go to the Wowhead quests page ( http://www.wowhead.com/quests ) and enter these criteria:
- Side: Horde or Alliance, depending on what you play
- Increases reputation with... : The Earthen Ring
- Completion: Available
- Click “Apply Filter” and it should come up with a list of all the quests you can still do that will give you reputation with The Earthen Ring.