ICQ is described as 'Is one of the oldest instant messengers. First developed by the Israeli company Mirabilis, sold to AOL, sold again and currenly owned by the Russian "mail.ru" group (known for one of the largest social networks)' and is a popular instant messenger in the social & communications category. There are more than 50 alternatives to ICQ for a variety of platforms, including Android, iPhone, Windows, Mac and Linux apps. The best ICQ alternative is Signal, which is both free and Open Source. Other great apps like ICQ are Telegram, Element, Pidgin and Tox.