BlackFire is an Xfire client for the Mac. Features:

• Supports clans
• Login using your existing xfire account (or create a new one on xfire.com if you haven't got an xfire account)</li
• Friends list with detailed status of what your friends are playing / doing
• Instant join of a game which a friend is playing
• Detects the game you are playing and also registers them
  So you have an easy list in BlackFire wich you can use as a launch bar!
• Custom status
• Supports Growl
• It has chat logs and a Chat log viewer
• Customizable sounds using sound sets in the extras section
• It has xfire games support from version 1.118 so you will always know wich games your friends
  are playing
• A wide variety of preferences
• Menubar icon wich shows number of missed messages
• Manage your friends, delete or add them
• Change your nickname
• It shows more info about each friend, and even supports Game server information (players, xp, ping)
  for a few games (not necessarily mac games)
• BlackFire has option for remembering your password and auto logging in!
• Timestamps in chat windows
• Chat with your xfire friends
• Chat with your xfire clan members
• Supports xfire favorite server list