All in one Messager

Pidgin
Supported chat networks:

• AIM
• Bonjour
• Gadu-Gadu
• Google Talk
• Groupwise
• ICQ
• IRC
• MSN
• MySpaceIM
• QQ
• SILC
• SIMPLE
• Sametime
• XMPP
• Yahoo!
• Zephyr
  
  
  
  
  Pidgin can also used in
  Ubuntu , Mac Os , Fedora Core , CentOS/ RHEL
  
  You can add addition plugin if you want
  http://developer.pidgin.im/wiki/ThirdPartyPlugins
  Download Link
  http://www.pidgin.im/download/
  http://portableapps.com/apps/internet/pidgin_portable (Pidgin Portable)
  

Hope Everyone Enjoys