ICQ – a simple way to communicate

ICQ is an open source instant messaging client.

This is an official Linux client. The latest update is in an experimental stage of development; there are some issues with users reporting memory leaks and instability.

The ICQ client includes software developed by the OpenSSL project for use in the OpenSSL Toolkit.

Features include:

  • History synchronization – conversation history in ICQ is now available on any of your devices.
  • Convert voice messages to text when you would rather read them.
  • Live chats.
  • High quality video chat.
  • Offline user messaging,
  • Multi-user chats.
  • Free daily-limited SMS sending.
  • Share files – share photos, videos, music and any other type of files with your ICQ contacts. Resumable file transfers are available.
  • Use free texting even if your contact does not use ICQ. When you send a message, it’s delivered as a free SMS.
  • Greeting cards.
  • Searchable user directory.
  • Synchronize contacts using your mobile phone.
  • Compact mode.
  • Enable/disable sounds.
  • Notifications.
  • Users can use emoticons while chatting with other users.
  • Large collection of free stickers for any occasion. Express your mood without words.
  • Variety of wallpaper to choose from.
  • Know when your message has been read – when your friend reads your message, a small avatar appears underneath it.
  • Cross-platform support – runs on Linux, Windows, and Mac OS X operating systems, as well as iOS, Android, and Windows phone.
  • Internationalization support: Chinese, Czech, English, French, German, Portuguese, Russian, Spanish, Turkish, Ukrainian, and Vietnamese languages are supported by the client.

Website: icq.com/linux
Support: GitHub code repository
Developer: Mail.Ru
License: Apache Public License 2.0

ICQ was first created by Israeli students in November 1996. In March 2016 the source code for the client was released under the Apache license.


ICQ is written in C++ and C. Learn C++ with our recommended free books and free tutorials. Learn C with our recommended free books and free tutorials.

Return to Instant Messaging Home Page

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