Jabber Instant Messenger - An Open Source IM based on XML. Jabber is interoperable with many different IM systems and hundreds of clients to choose from for every operating system.

Imici Instant Messenger - Mainly for business use, it is also for home users. Imici is interoperable with MSN, AIM, Yahoo, and ICQ. Imici includes features such as away messages, co-browsing, message logging, and an email checker.

Yahoo! Messenger - Send instant messages and see when friends are online with Yahoo! Messenger. You can also use Yahoo! Messenger to check for new mail in your Yahoo! Mail account, or get alerted for news, stock quotes and sports scores.

HotMessenger - An online, web based instant messaging and chat system. Send online greetings and set up an online organizer. WebTV user compatible.

Odigo - Instant messaging plus site to site communication, file transfers, and see others based on interests. Interoperable with AIM, ICQ, and Yahoo.

Easy Message Instant Messenger - The free all in one instant messenger including MSN Messenger, Yahoo Messenger, AOL Messenger, and ICQ Messenger.

EveryTalk - A browser-based application providing services including instant messaging, task scheduler and customized links.

EveryBuddy - Messenger which supports most services for the Linux platform.

.NET Messenger Service - Microsoft's .NET Messenger which includes Instant Messaging, Voice and Video conferencing, file transfers, whiteboard, and application sharing.