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Campfire
Facilitates real-time group chat and file sharing through any web browser.
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eBuddy
Provides simultaneous, integrated access to multiple instant messaging services through any web browser. With a version optimized for mobile access.
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ILoveIM
Web messenger service that eliminates the need to download IM clients. Features most of the functions of major IM clients in a web-based interface.
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imo.im
Provides a web based interface to a variety of services, including Yahoo, AOL, Google Talk, MySpace, and Facebook.
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LiveGO
Web-based platform for instant messengers providing convenient simultaneous access to multiple accounts through a single interface.
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PHP121 Instant Messenger
Free web-based instant messenger written entirely in PHP. Operates in multiple OS environments, including Windows and Linux.
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Yahoo! Messenger
Access to the Yahoo! IM service from any Java-enabled web browser.