Hubub is a simple TCP data reflector for quickly building distributed applications. It can broadcast data from one client to many (or many to many) with little system overhead. Written in heavily commented 'c', with example clients in TCL.
LJClient is a GUI client for making posts to LiveJournal written in TCL/Tk. It is aimed mainly at Unix/Linux users that do not run KDE or Gnome. It will provide a full featured cross platform client.