This is not made by me, I only found it on "worldofwarcraft" forums...didn't see anything like this here, so here we go...(read the thread before flame -.-`6)
This is a little window application designed to help you in choosing sets of armor for your bear (form). You can play with different items, enchants, and buffs, and see how they affect your tanking stats.
Based on your current stats, it will also display a graph of the value of known items for a selected slot, displaying a mitigation rating, a survival rating, and an overall rating. These ratings, along with most of the other calculations in the application, are based on the fine spreadsheet.
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FAQ
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Q: I launched Rawr, but I just see a black window with some red text on it. Has it hung?
A: No, just let it go for a min. On the first launch of Rawr, it will download all the icons for items it knows about, from the Armory. This can take 1-2 minutes, possibly more on slow connections. If anything goes wrong, it'll display an error message. Just be patient, please.
Q: I get an error on load, "To run this application you must first install..." or "The application failed to initialize properly (0xc0000135)." How do I fix this?
A: Install .NET Framework 2.0 from Microsoft. If it still doesn't work, uninstall .NET Framework completely, reinstall .NET Framework 2.0, and try Rawr again. Download link for .NET Framework 2.0 from Microsoft: Download details: .NET Framework Version 2.0 Redistributable Package (x86)
Q: There's an item missing! Can you please add [Some Item]?
A: No, Rawr is designed so that I wouldn't need to update it with new items every time a new tanking item was found. You can add items to it yourself, very fast, and very easily. Look the item up on wowhead or thottbot, and remember the item ID # from the URL on wowhead or thottbot. Goto Tools > Edit Items, click Add, type that item ID # in, hit OK, and *poof*, you'll have the item. Another thing you can do, after loading your character from the Armory, is choose Tools > Load Possible Upgrades from Armory. This feature will take *a while*, like 5+ min, but will download all the items that the Armory thinks are potential upgrades for you, and Rawr agrees are potentially upgrades. It's a good idea to run this a few days after a major content patch.
Q: Can you make it, or does Rawr work for Cats, Moonkin, or Trees?
A: Right now, no, the huge focus is on Bears.
See You