The PlanetaMessenger.org Libraries project is a set of open source instant messenger libraries used and maintained by PlanetaMessenger.org. You can find protocol implementation for MSN, ICQ, ComVC networks for use on standalone and server applications.
The MUSCLE system is a fast, portable, flexible client-server system for distributed applications. Clients send BMessage-like PortableMessages to each other either directly or via a centralized server (with built-in database and 'live query' support).
Java Instant Message (IM) Library, Client and Tools. Flexible framework to design your own. AIM, ICQ, Yahoo, MSN, Jabber, SMS, Nate, GoogleTalk. GUI, spell checking and more. Includes a web interface for remote/cell access. Mac, Win, Linux friendly
SimplissIM is a simple instant messenger for local networks where people want to chat, not tweak their software settings. Automatic presence, no server needed, no list of contact to maintain (people appear automatically), seamless file sending...
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Geographic restrictions, eligibility, and terms apply.
SyncShare Server is a secure messaging and real-time collaboration
platform. Build solutions to connect people, data, and applications through
firewalls and mobile devices. It handles all networking, security issues and lets
one focus on the business