IMalizer is, or will be, a generic two part Instant Messenger, with a server that is always connected to the im networks, and a client that connects to the server. Will support ICQ and AIM, and possibly MSN.
Lightweight, modern, flexible and well-customisable cross-platform multi-protocol instant messaging client
Small and portable ICQ library and client written in pure Python.
Lille is a full-featured ICQ client for Pocket PC's built on top of the .NET Compact Framework.
An instant messenger project written in C# and XAML, intended to allow high customization via plugins and skins.
The BeOS Instant Messaging Kit project aims to create a BeOS-centric, generic instant messaging servuice for workstations. The system will follow the BeOS kits/servers model, and different IM protocols will be supported through add-ons to the im_server,
The project already exists and it is now working and being gradually implemented. Here is its address: http://www.saber-digital.net ou http://www.biblioteca.pro.br Check it out!