Mia Chat is an Ajaxed PHP chat application which is very simple to use & install.

It functions similar to the messenger applications, you can add buddies, chat with several users at the same time, change your online status & more.

PHP - Ajax Chat

This PHP chat supports many databases for storing data like MySQL, MSSQL, Oracle 8+, MS SQL Server 2000+, SQLite 2+ and PostgreSQL 7+.

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