GoogleTalk

aka Google Chat

Google Instant Messaging/VoIP server/client

based on Jabber, SIP, etc.

http://www.google.com/talk/

as of Jan'2006 supporting XMPP.

For IPhone you need 3rd party client like V Tok.

Aug'2012 update: list of 5.
May'2013: now there's IOS version of new Hangouts app 2013-05-23-GoogleIntegratingMessagingUnderHangoutsReducingXmppFederation

Edited: 2015-01-13 00:00:00 | Tweet this! | Search Twitter for discussion

Bill Seitz