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Reputation Gain 2 will add the needed number of items or kills to get to certain reputation levels with factions to their tooltips. Check the screenshot below to get the idea.

In the first example, the item is needed for Zandalar Tribe, and only needs 451 more to get to Exalted. The second speaks for itself.
Please delete your RepGain2 folder within Interface\AddOns\RepGain2 before upgrading to this version as I believe it will help to prevent any possible errors that might arise. Further, RepGain2 now supports Ace3 Localization. As a result of this, some files were moved around, and it would probably be best to start with a fresh version of the AddOn.
Most of the data is based on the reputation calculator at http://www.wowjuju.com, so it's possible some data is missing or wrong. Since I can't test all the factions and if you notice a faction that's missing, or an item/npc that yields wrong reputation, or... the list goes on, feel free to open a ticket at wowace: http://www.wowace.com/projects/repgain2, and I'll look into it. Be sure to check existing tickets though, since these include the factions which need some work.
(*) Needs some quest or championing to be added, so it's possible there's not a single trace of these factions. Once again, when you notice some info missing or incorrect, and it's not in the todo list below, please open a ticket at http://www.wowace.com/projects/repgain2.
(x) Needs a check from the supervisor :P
Please check out the Localization page (http://www.wowace.com/addons/repgain2/localization/) to easily help with translations.
This is a follow up to the project "Reputation Gain" by jpiolho. jpiolho's Reputation Gain has been discontinued, so I have asked & recieved permission to continue development for this addon under my name with credit to the original author. It will be a rewrite with some inspiration from the old version.
Thank you jpiolho for this idea and opportunity!
Original idea & author: jpiolho
Current authors: texke (Jitsuji @ Terenas-H EU) & incith
Thanks to yoshimo for pointing me in the right direction in using NPC & item ID's to ease localization pains.
Thanks to all translators!
When you download a mod, please be sure that the mod is compatible with your translation of wow. Some mods only work on the US versions, while some only work on some of the various European versions. These variations are called "Localizations".
When Blizzard patches WoW, they change the Interface number. This means that all mods will be "out of date" unless or until the author releases a new version for that interface. Some people go into the .toc files and update the numbers themselves, but this is STRONGLY advised against as it will cause problems locating possible incompatibilities addons. When you log into WoW after a patch, you DO NOT have to delete your interface directory. All you have to do is simply tell WoW to ignore the interface numbers and load all the mods anyway. All you have to do is, while at the "character select" screen, look in the lower left corner and click on the "addons" button. A window will pop up listing all your installed mods.
If you look in the upper left corner of that window there should be a box that says "Load Out of Date AddOns". You want to CHECK this box. Now simply go into WoW normally and all your mods should load. As of the 1.9 patch, you will have to do this after EVERY patch/update that Blizzard posts! If you encounter any problems with a mod after a patch, please be sure to let the author of the mod know so they can fix it.
See also: About "Out Of Date AddOns"
WoW addons are not platformed based. As such, they can be used on either Mac or PC. You can extract both .zip and .rar files on a Mac using StuffitExpander.
World of Warcraft
|_ Interface
|_AddOns
|_*AddonName*
|_ *AddonName*.toc
|_ *AddonName*.xml
|_ *AddonName*.lua
|_ (possibly others as well)...