A chat client enables realtime internet communication between two or more users wherein either user enters text and the text immediately appears on the monitor of the others involved in the chat.
Regular Websites
America Online's instant messenger started it all. The site provides AIM profiles, chat groups, and free downloads. - AOL Instant Message
http://dashboard.aim.com/aim
Internet chat program contains free download, chat groups, and ICQ2Go, a portable version accessible from any computer. - ICQ
http://www.icq.com/
IM client connects to numerous networks, including AIM, Google Talk, IRC, MSN, ICQ, Yahoo, and MySpaceIM. - Pidgin
http://www.pidgin.im/
Horde chat/live web support application that provides for support staff to converse with each other and with customers, guests, or patrons; provides an offline interface. - Rakim
http://horde.org/rakim/
Available for Mac or PC, this chat interface, Yahoo offers a free download of the interface, a list of different chat groups, and ways to connect via mobile phone or web. - Yahoo Messenger
http://messenger.yahoo.com/