Instant Messaging Clients, including: Trillian (software), Comparison Of Instant Messaging Clients, Instant Mobile Messenger, Multiprotocol Instant ... Messenger, Easy Message, Meebo, Orooni, Mxit

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More info: An instant messaging client is a software application that enables the user to engage in instant messaging. Instant messaging clients utilize one or more instant messaging protocols. Popular protocols include OSCAR (AIM, ICQ), XMPP, IRC, MSNP (Windows Live Messenger), and Skype. Many popular instant messaging clients also include Voice over Internet Protocol (VOIP) and videoconferencing capabilities.