Instant Messengers and Chat Clients

• Windows Live Messenger
  Microsoft
  Windows / Mac
• Google Wave
  Google
  Windows / Mac
• Google Talk
  Google
  Windows
• Yahoo! Messenger
  Yahoo!
  Windows / Mac
• AOL Instant Messenger
  America Online
  Windows / Mac / Linux / iPhone/iPod touch / Windows Mobile
• ICQ
  Mirabilis
  Windows / Mac
• Miranda IM
  Miranda IM Project
  Windows
• Trillian
  Cerulean Studios
  Windows / Mac / iPhone/iPod touch
• Pidgin
  Sean Egan et al.
  Windows / Mac / Fedora Core / CentOS/RHEL
• Digsby
  dotSyntax
  Windows / Mac / Linux
• Adium
  Adium team
  Mac
• Psi
  The Psi Team
  Windows / Mac / Linux
• Coccinella
  Mats Bengtsson
  Windows / Mac / Linux
• aMSN
  The aMSN team
  Windows / Mac / Linux / FreeBSD
• Fire
  Fire Development Team
  Mac
• Skype
  Skype Technologies S.A.
  Windows / Mac / Linux / Mobile phones / PSP
• Vbuzzer Messenger
  Softroute Corporation
  Windows
• QuteCom
  QuteCom Team
  Windows / Mac / Linux / OpenSUSE
• MySpaceIM
  MySpace
  Windows
• mIRC
  Khaled Mardam-Bey
  Windows
• Colloquy
  Timothy
  Mac
• X-Chat
  Peter Zelezny
  Windows / Linux
• HydraIRC
  Hydra Productions
  Windows
• Xfire
  Xfire
  Windows
• Ventrilo
  Flagship Industries
  Windows / Mac
• TeamSpeak
  TeamSpeak Systems
  Windows / Mac / Linux
• Eyeball Chat
  Eyeball Networks
  Windows