ATutor - Free, open source LMS with integrated social networking
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Sublime Tutor - Learn Sublime Text from a tutor who sits inside the editor
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
TutorMe - Connect with a high-quality tutor in under 30 seconds
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.