Tapioca is a framework for Voice over IP (VoIP) and IM applications. Its main goal is to provide an easy way for developing and using VoIP/IM services in any kind of application. It provides a pluggable interface for different protocols, such as SIP/XMPP
icqnd is a GTK-2 GUI for the popular ICQ program Licq. It's written in C++ and uses GTK/GLib. It features a clean, intuitive interface, the GTK-2 look&feel and all the licq IM backend supports (messages, chat, file transfers, history, search, ...)
Zeus is a XChat script (written in perl) that provides a GUIinterface (through the use of Tk) for "Autoget" and "Omenserve" two mIRC scripts used for sharing files on the IRC.
XChat TTS script is an perl written XChat2 script that speaks out messages in irc channels, and more.
It provides an interface to setup the functions or view the online help.
Aeru IRC is IRC Client for the .NET Framework. It made with C# programming language and features a full Graphical Interface. Aeru IRC uses XML to store servers and channels and app settings. The GUI uses the power of .NET.
This program includes a guiinterface and protocol(s) written in Java to be used as a chat program. The primary chat protocol is MSN, but the program is expanable with "plug-ins" that allow other protocols to be added such as Yahoo!, AIM, and the like.
Rendezvous is written in Java and provides a GUI for human collaboration (chat, instant messaging, audio video conferencing, etc.). It is a client for the DataShare server (http://datashare.sourceforge.net). Try the Rendezvous demo link on the Home Page
Send multiple Microsoft 'NET SEND' messages to any user or machine on a Microsoft network. GUIinterface. Many features to be added. Written in Python and the GUI has been done in wxPython.
A chat server and client written in perl. The server is in a stable state and right now the client is in heavy development. The Tk module has been added and a GUI is being constructed to give the client an interface that is easy to use.
A secure PKI-based client/server encrypted chat engine under development in Java. Encryption will be supported via JCE and PKCS#11. A simple Java interface can be implemented by other projects wishing to develop a Java GUI or CLI for the client.