A small client for the Jabber instant messaging system
Tcl/Tk is a graphical scripting language. The choice of Tcl/Tk for a Jabber client is three-fold:
it is portable: once you install a Tcl/Tk interpreter on your system, the Tkabber script "just runs" - without having to compile anything;

Here are some key features of "Tkabber":

sessions:
· hashed passwords
· encrypted sessions (if you install an optional extension)
· login via HTTP p.r.o.x.y
· user-defined hooks for connection establishment and release
· XMPP/Jabber MIME type
messages:
· emoticons
· signed/encrypted messages (if you install an optional extension)
· file transfers (HTTP, DTCP and IBB transports)
· f.i.l.t.e.rs
· groupchat (GroupChat-1.0 and Multi-User Chat conferencing protocols)
· headline messages
· message events
· completions of nick and commands
· hyperlinks
· user-defined hooks for chat window events
presence:
· avatars
· browsing
· groupchat and roster invitations
· conference room bookmarks
· annotations about roster items
· signed presence (if you install an optional extension)
· vCards
· user-defined hooks for presence changes
windowing:
· configurable look-and-feel via a resources database
· unicode
· tabbed/non-tabbed interface
· sound notifications
· nested roster groups
· for Unix: auto-away, spell checking, KDE docking, and WMaker icons
· for Windows: auto-away, and taskbar icons
click here to download