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Joomla! is a free open source content management system for publishing content on the World Wide Web and intranets. The system includes features such as page caching to improve performance, RSS feeds, printable versions of pages, news flashes, blogs, polls, website searching, and language internationalization. Joomla is licensed under the GPL, and is the result of a fork of Mambo.

Trillian is a proprietary multiprotocol instant messaging application for Windows created by Cerulean Studios that can connect to multiple IM services, such as AIM, ICQ, Windows Live Messenger, Yahoo! Messenger, IRC, Novell GroupWise Messenger, Bonjour, Jabber, and Skype networks (the latter four with Trillian Pro which allows for additional plugins).

MySpaceIM is the official instant messaging client for the social networking site, MySpace.
Features
MySpaceIM integrates several features into the IM. Currently these are the features included:

Basic instant messaging to other MySpace users.
Shortcuts to MySpace.com features and profiles.
Imports friends from MySpace into your contacts list in MySpaceIM.
Instant alerts for all requests, messages, and comments.
Integrated music player, which plays your friends’ profile songs.
Switchable conversation views, such as: traditional IM, with pictures, or with cartoon-like balloons.
Skinnable interface.
Shareable custom backgrounds in message windows.

Pidgin is an instant messaging program for Windows, Linux, BSD, and other Unixes. You can talk to your friends using AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr.
Pidgin can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AIM, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.