ICQ

ICQ is a popular [instant messenger]? service created by Mirabilis? in the late 1990-ies.

The protocol used by ICQ is proprietary?, but a number of people have created more or less compatible clones of the software, including:

• GtkICQ?
• Licq?
• centericq?

The name ICQ is a play on the phrase "I seek you".

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External Links:

• [The Official ICQ Website]