RepByZone

As you wander around Azeroth, your reputation bar will switch depending on where you are, not by which quest gave you a faction bump.

Supports

Zones by faction: Stormwind, Darkspear Trolls, Gnomeregan Exiles, Orgrimmar, etc.
Instances by faction: Hydraxian Waterlords, Brood of Nozdormu, etc
Battlegrounds by faction: Silverpike Guard, Warsong Outriders, etc
Subzones by faction: several little areas in various zones have pockets of faction hubs
WoD Bodyguards' reputations can be watched instead of zone reputations
Cataclysm and retail support equipped capital city tabards while in dungeons
Option to stop watching capital city tabard factions at Exalted
Toggle on/off switching watched factions while you are taking taxi flights
If you haven't discovered a zone reputation or there isn't one, select a default fallback watched reputation

RepByZone can be localized using Curseforge's online localization URL.

If you encountered an error, file a report on GitHub and I will be notified.

It is not possible to display zone or subzone data for reputations the character has not yet discovered. Once a character gains or loses any amount of reputation with that faction and moves around the zone, RBZ will update.
Discovering the faction may require the character to explore other zones or even continents, then kill mobs or do quests for the faction.