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  Slack

  Slack brings all your communication together in one place. It’s real-time messaging, archiving and search for modern teams.
  http://www.slack.com

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  Jostle

  Jostle’s cloud-based simple intranet solution; the next-generation intranet that improves employee engagement and internal communications.
  http://www.jostle.me

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  Skype

  Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
  http://www.skype.com

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  WhatsApp

  WhatsApp Messenger :: cross-platform mobile messaging app for iPhone, BlackBerry, Android, Windows Phone and Nokia. Send text, video, images, audio for free.
  http://www.whatsapp.com

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  We Chat

  Available for all kinds of platforms; enjoy group chat; support voice,photo,video and text messages.
  http://www.wechat.com

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  ICQ

  http://www.icq.com

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  Zopim

  Award-winning live chat software solution. Chat with visitors in real-time and increase conversions. Sales and support made easy for businesses. Free 14-day ...
  http://www.zopim.com

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  HipChat

  HipChat is hosted group chat and video chat built for teams. Supercharge real-time collaboration with persistent chat rooms, file sharing, and screen sharing.
  http://www.hipchat.com