Gajim is a fully-featured and easy to use Jabber/XMPP client. It is a free and open source instant messenging application that's powerful.
Here are some screenshots to illustrate the features and user interface of this application:
Jabber client that can send messages with friends, transfer files, join chat groups, bookmark chat rooms etc. Screenshot of Gajim - 315px · 445pxA Jabber client for easy chatting. Screenshot of Gajim - 751px · 500pxInstant messaging client for the XMPP protocol for Windows PC. Screenshot of Gajim - 751px · 500pxFree Jabber/XMPP client for Windows PC. Screenshot of Gajim - 674px · 439pxJabber instant messaging client for video, voice. Screenshot of Gajim - 1165px · 546px