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Alcamy - Free, open self-learning platform. Learn & teach anything.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
EduDo - EduDo is a video discussion platform
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.
Lrnkey - Lrnkey.com is a global online marketplace that easily connects you to live instructors and tutors across the planet.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.