Conqueror is a small addon that is used to assist in the grind for the Conqueror title (or Justicar for Alliance). When inside an Arathi Basin or Warsong Gulch game, text will be attached to the Scoreboard frame that displays the ammount of flag captures or resources required for Exalted with the relevant faction.
In Warsong Gulch:
"XXX [Faction Flag Symbol] until Exalted"
In Arathi Basin:
"XXXXXX resources until Exalted"
In Alterac Valley:
Nothing. AV rep comes from so many different sources and is so easy to get that it is not included in this addon.
In addition, by typing /conq or /conqueror the strings will be output to the Chat Frame so you can see your progress from outside the battleground.