ring™ uses your mobile internet connection to make peer-to-peer VoIP calls, send instant messages and talk with VoIP applications such as Skype, Google Talk , MSN Messenger and SIP at no extra cost.
MGTalk is a Jabber client for j2me midp 2.0 platform (midlet), supports some Google Talk features. May run on any j2me midp 2.0 mobile phone or communicator.