ICQ is an instant messaging computer program, which was first developed and popularized by the Israeli company Mirabilis, then bought by America Online, and since April 2010 owned by Digital Sky Technologies (Russia). The name ICQ is a homophone for the phrase "I seek you". This is an adaptation of the Morse code callout "CQ", which means "calling any station".

Windows Live Messenger (formerly named MSN Messenger) is an instant messaging client created by Microsoft that is currently designed to work with Windows XP (32-bit XP only), Windows Vista, Windows 7, and Windows Mobile. The client has been part of Microsoft's Windows Live set of online services since 2005. It connects to Microsoft's .NET Messenger Service. The client was first released as MSN Messenger on July 22, 1999, and as Windows Live...
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mIRC is an Internet Relay Chat (IRC) client for Microsoft Windows, created in 1995 and developed by Khaled Mardam-Bey. Although it is a fully functional chat utility, its integrated scripting language makes it extensible and versatile.

Pidgin is a chat program which lets you log in to accounts on multiple chat networks simultaneously. This means that you can be chatting with friends on MSN, talking to a friend on Google Talk, and sitting in a Yahoo chat room all at the same time.

Pidgin runs on Windows, Linux, and other UNIX operating systems.

PrimalScript 2009 maintains the features of PrimalScript 2007 Enterprise, plus adds new functionality to enhance your scripting, all at PrimalScript 2007 Professional's LOWER Price! More than just an admin script editor, PrimalScript 2009 is the standard to which others compare themselves. It is the only Universal Scripting Environment (USE) that supports all of the file types and languages you need to work with every day. Whether you are a...
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XChat is an IRC chat program for both Linux and Windows. It allows you to join multiple IRC channels (chat rooms) at the same time, talk publicly, private one-on-one conversations etc. Even file transfers are possible.

Yahoo! Messenger is an advertisement-supported instant messaging client and associated protocol provided by Yahoo!. Yahoo! Messenger is provided free of charge and can be downloaded and used with a generic "Yahoo! ID" which also allows access to other Yahoo! services, such as Yahoo! Mail, where users can be automatically notified when they receive new email. Yahoo! also offers PC-PC, PC-Phone and Phone-to-PC service, file transfers, webcam hosting, text messaging service, and chat rooms in various categories.