Gajim is Jabber client, work with GNOME.

FEATURES:

• Tabbed chat window and single window modes
  
• Group chat support (with MUC protocol), invitation, chat to groupchat transformation, minimize groupchat to roster
  
• Emoticons, Avatars, PEP (user activity, mood and tune)
  
• Audio / Video conferences
  
• File transfer, Room Bookmarks
  
• Metacontacts Support
  
• Trayicon, Speller, extented chat history functionalities
  
• TLS, GPG and End-To-End encryption support (with SSL legacy support)
  
• Transport Registration support
  
• Service Discovery including Nodes, user search
  
• Wikipedia, dictionary and search engine lookup
  
• Multiple accounts support
  
• DBus Capabilities. Read more information
  
• XML Consol ... Read more »