Facebook IM is a freeware Windows Phone application that brings the facebook chat on to your Pocket PC.
It requires an active internet connection on your device. No 3rd party registration is needed, this app connected directly to the Facebook website
Palringo is a free IM (Instant Messaging) application.
Palringo is the ultimate Instant Messaging client for mobile phones and computers.
Now you can chat with all your buddies, no matter what IM they use, all from one universal Instant Messenger
iSkoot for Skype- a free software that delivers the features of Skype to your Pocket PC. Offers enhanced chat, inbound/outbound Skype calls, presence info, and SkypeOut! With iSkoot for Skype, you can make & receive Skype calls, chat, and use SkypeOut to call regular numbers anywhere in the world
MXit is a FREE instant messaging application for your mobile phone and PCs. This means that you can chat to other MXit users on their mobiles and PCs, anywhere in the world, for FREE.
It enables you to send and receive text messages to and from mobile phones and PCs via the Internet using GPRS or 3G, rather than by using standard SMS technology
QIP Mobile Messenger is a mobile version of the popular messenger QIP, which is used by more than 20 million people in Russia and abroad.
Users can send each other messages via protocols: ICQ, XMPP, Mail.ru
Yeigo is a free and innovative application for your mobile phone, which uses your phones Internet connection, (don't worry, your phone has one) to offer you free calls, Instant Messaging and cut-price text messages
Talkonaut is free mobile calling, VoIP enabled, Google Talk like application for your mobile phone. Talkonaut supports Jabber, Google Talk, ICQ, MSN, AIM and Yahoo networks both for chatting and voice calling. Talkonaut allows to make free VoIP over GPRS/EDGE calls, as well as calls over 3G, or WIFI
SmartTouch is a mobile widget platform that provides an exceptional experience for users to enjoy seamless access to branded content and services such as Facebook and Google without the need for a data plan!