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.
DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Whereby (formerly appear.in) - Collaborate from anywhere - video meetings with no downloads
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.
Tilde - Free, instant meeting rooms for all your collaborative needs