ICQ is a software that lets you find your friends and associates online in real time. You can create a Contact List containing only people you want to have there, you can send them messages, chat with them, send files, configure ICQ to work with external applications and more.
ICQ ("I seek you") is the popular instant messaging software that lets you communicate with friends and colleagues in real time. Features include a quick launch bar, music file support, ICQmail, a new answering service, and more. This version also works with Internet TCP/IP connections, allowing communication behind firewalls. Additional features include Web searching from within ICQ; support for an unlimited amount of text in messages; a variety of font styles and text and background colors to choose from; a pop-up menu of built-in services such as reminders, to-do lists, notes, and email options; and a handy tabbed chart of ICQ networks, including Sports, Students, and Science and Technology. In addition, a Groups feature makes it possible to organize large contact lists into manageable categories. Works behind a firewall!

The license of this software is Freeware, you can free download and free use this instant messenger software.