The SDBA Revolution Instant Messaging Application Server is a server for hosting IM applications. It uses a web server framework to provide a familiar architecture for developers, plus customizatins specifically for Instant Messaging Applications.
The RSS-IM Gateway allows you to let visitors read your RSS feed through an Instant Messgaing client, using AIM, MSN, ICQ, YIM, or Jabber. A Perl application, it is very easy to set up and can easily handle the hundreds of users you can expect to use it.
nicq makes possible to work with ICQ (after minor changes - with any OSCAR based) messaging network. Currently nicq supports: logging in (MD5-based authorization supported), setting up status/capabilities, sending/receiving messages.
IMagine stands for Instant Messaging anywhere. Its unique combination of a web interface and a gaim proxy server allows users to have their entire instant messaging sessions (not just accounts) accessible from anywhere.