External Review References
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Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Slack - A messaging app for teams who see through the Earth!
Hangouts - Hangouts bring conversations to life with photos, emoji, and even group video calls for free. Connect with friends across computers, Android, and Apple devices.
GoToMeeting - GoToMeeting is a web conferencing service offering a range of services which are available on Mac, PC, iOS and Android devices.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
join.me - Instant screen sharing. Instant Aha!