"Google Talk enables you to call or send instant messages to your friends for free--anytime, anywhere in the world." (from the talk.google.com page)

Windows Live Messenger is an instant messaging program from Microsoft.  Formerly MSN Messenger Service.

Native alternatives for non-windows platforms
- Gaim (works with Yahoo!, MSN, ICQ and many others)

- Kopete (supports advanced MSN features. Part of KDE's PIM package (kdepim))

- aMSN (supports webcam, nudge, inkdraw and other advanced MSN features)

Yahoo! Messenger (YIM) - an instant messenger to communicate with other Yahoo members.

Native version for non-windows platforms
- Yahoo! Messenger for Unix

Native alternatives for non-windows platforms
- Pidgin (works with Yahoo!, MSN, ICQ and many others, but without Audio or Webcam support.)

Old Versions of the Software can be downloaded in OldApps

This is an application also good for the Dogfood Challenge (later, when it works...).

When reporting test results, please follow exactly the definitions for the test results!
To make it clear: if it didn't run or is unable to connect to somewhere, this is a major lake of function. So it is garbage.