Instantbird is a nice IM client that support multiple instant messaging protocols. With Instantbird, you could integrate the following protocols in a single application: AIM, Facebook Chat, Gadu-Gadu, Google Talk, GroupWise, ICQ, IRC, MSN, MySpaceIM, Netsoul, QQ, SIMPLE, Twitter, XMPP, Yahoo, Yhao …

Google Talk is a free IM Client from Google for Text chat and Voice chat. Chat with friends and family on the internet using Google Chat. Google Talk uses XMPP instant messaging protocols to provide real-time messaging, offline messaging and voice mailing. Features of Google Talk:  & …